Después de actualizar Manjaro no arranca

Con ésta van dos veces que después de actualizar Manjaro (cuando coincide actualización del kernel) el equipo no arranca. Después de cargar la bios de la placa base, cuando debería empezar a cargar el grub, se queda con la pantalla en negro y ya no hace nada de nada. Tengo instalado Manjaro en tres discos distintos: un hdd, un sdd y un disco m.2. Como mi Manjaro “principal” estaba en el disco M.2, creí que el fallo estaba en que la actualización del GRUB no reconocía ese disco (puesto que además, saltaba ese aviso en el log). Pero, después de actualizar los otros Manjaro tuve el mismo problema.
Llevo varios años usando Manjaro y estaba muy contento. Pero de un tiempo a esta parte, con cada actualización un problema nuevo… que si en el amule falla la interfaz de usuario (no se ven gráficos, por ejemplo), que si el vlc se cierra al intentar cargar depende qué archivo mkv, que si ya no arranca el sistema…
Estoy pensando seriamente volver a Ubuntu.
Adjunto la salida del comando inxi -Fxxx

System:
  Host: manjaro Kernel: 6.1.19-1-MANJARO arch: x86_64 bits: 64 compiler: gcc
    v: 12.2.1 Desktop: KDE Plasma v: 5.26.5 tk: Qt v: 5.15.8 wm: kwin_x11
    dm: SDDM Distro: Manjaro Linux base: Arch Linux
Machine:
  Type: Desktop Mobo: Micro-Star model: X570-A PRO (MS-7C37) v: 3.0
    serial: K216169211 UEFI: American Megatrends v: H.70 date: 01/09/2020
CPU:
  Info: 6-core model: AMD Ryzen 5 3600 bits: 64 type: MT MCP smt: enabled
    arch: Zen 2 rev: 0 cache: L1: 384 KiB L2: 3 MiB L3: 32 MiB
  Speed (MHz): avg: 2550 high: 3600 min/max: 2200/4208 boost: enabled
    volts: 1.1 V ext-clock: 100 MHz cores: 1: 3600 2: 2200 3: 3600 4: 2200
    5: 2200 6: 2200 7: 2200 8: 2200 9: 2200 10: 3600 11: 2200 12: 2200
    bogomips: 86439
  Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm
Graphics:
  Device-1: NVIDIA TU117 [GeForce GTX 1650] vendor: ASUSTeK driver: nvidia
    v: 525.89.02 arch: Turing pcie: speed: 8 GT/s lanes: 16 bus-ID: 2d:00.0
    chip-ID: 10de:1f82 class-ID: 0300
  Display: x11 server: X.Org v: 21.1.7 compositor: kwin_x11 driver: X:
    loaded: nvidia gpu: nvidia display-ID: :0 screens: 1
  Screen-1: 0 s-res: 3840x1080 s-dpi: 101 s-size: 966x272mm (38.03x10.71")
    s-diag: 1004mm (39.51")
  Monitor-1: DP-0 pos: right res: 1920x1080 hz: 60 dpi: 102
    size: 477x268mm (18.78x10.55") diag: 547mm (21.54") modes: N/A
  Monitor-2: HDMI-1 pos: primary,left res: 1920x1080 hz: 60 dpi: 102
    size: 477x268mm (18.78x10.55") diag: 547mm (21.54") modes: N/A
  API: OpenGL v: 4.6.0 NVIDIA 525.89.02 renderer: NVIDIA GeForce GTX
    1650/PCIe/SSE2 direct-render: Yes
Audio:
  Device-1: NVIDIA vendor: ASUSTeK driver: snd_hda_intel v: kernel pcie:
    speed: 8 GT/s lanes: 16 bus-ID: 2d:00.1 chip-ID: 10de:10fa class-ID: 0403
  Device-2: AMD Starship/Matisse HD Audio vendor: Micro-Star MSI X570-A PRO
    driver: snd_hda_intel v: kernel pcie: speed: 16 GT/s lanes: 16
    bus-ID: 2f:00.4 chip-ID: 1022:1487 class-ID: 0403
  Sound API: ALSA v: k6.1.19-1-MANJARO running: yes
  Sound Server-1: JACK v: 1.9.22 running: no
  Sound Server-2: PulseAudio v: 16.1 running: yes
  Sound Server-3: PipeWire v: 0.3.65 running: yes
Network:
  Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet
    vendor: Micro-Star MSI X570-A PRO driver: r8169 v: kernel pcie:
    speed: 2.5 GT/s lanes: 1 port: d000 bus-ID: 27:00.0 chip-ID: 10ec:8168
    class-ID: 0200
  IF: enp39s0 state: up speed: 1000 Mbps duplex: full mac: 2c:f0:5d:0a:0a:26
Drives:
  Local Storage: total: 19.57 TiB used: 115.65 GiB (0.6%)
  ID-1: /dev/nvme0n1 vendor: Kingston model: SNV2S1000G size: 931.51 GiB
    speed: 63.2 Gb/s lanes: 4 type: SSD serial: 50026B7686311B2F rev: SBM02103
    temp: 33.9 C scheme: GPT
  ID-2: /dev/nvme1n1 vendor: KIOXIA model: EXCERIA SSD size: 931.51 GiB
    speed: 31.6 Gb/s lanes: 4 type: SSD serial: 41NA23KQK2U2 rev: ECFA12.b
    temp: 43.9 C scheme: GPT
  ID-3: /dev/sda vendor: Kingston model: SA400S37480G size: 447.13 GiB
    speed: 6.0 Gb/s type: SSD serial: 50026B7682860A6F rev: B1C2 scheme: GPT
  ID-4: /dev/sdb vendor: SanDisk model: ST8000DM004-2CX188 size: 7.28 TiB
    speed: 6.0 Gb/s type: HDD rpm: 5425 serial: ZCT2RTWL rev: 0001 scheme: GPT
  ID-5: /dev/sdc vendor: Western Digital model: WD30EZRX-00D8PB0
    size: 2.73 TiB speed: 6.0 Gb/s type: HDD rpm: 5400 serial: WD-WCC4N6ZUX3R0
    rev: 0A80 scheme: GPT
  ID-6: /dev/sdd vendor: Toshiba model: HDWD130 size: 2.73 TiB
    speed: 6.0 Gb/s type: HDD rpm: 7200 serial: 79TD3YPAS rev: ACF0 scheme: GPT
  ID-7: /dev/sde vendor: Toshiba model: HDWD120 size: 1.82 TiB
    speed: 6.0 Gb/s type: HDD rpm: 7200 serial: 892BU3RCS rev: ACF0 scheme: GPT
  ID-8: /dev/sdf vendor: Western Digital model: WD30EZRX-00DC0B0
    size: 2.73 TiB speed: 6.0 Gb/s type: N/A serial: WD-WMC1T1110119 rev: 0A80
    scheme: GPT
  ID-9: /dev/sdg type: USB model: USB DISK 2.0 size: 28.91 GiB type: N/A
    serial: 9000961FB9861095 rev: PMAP scheme: GPT
Partition:
  Message: No partition data found.
Swap:
  Alert: No swap data was found.
Sensors:
  System Temperatures: cpu: 56.4 C mobo: N/A gpu: nvidia temp: 45 C
  Fan Speeds (RPM): N/A gpu: nvidia fan: 0%
Info:
  Processes: 277 Uptime: 20m wakeups: 0 Memory: 31.3 GiB
  used: 3.98 GiB (12.7%) Init: systemd v: 252 default: graphical Compilers:
  gcc: 12.2.1 clang: 15.0.7 Packages: pm: pacman pkgs: 1196 Shell: Zsh (sudo)
  v: 5.9 default: Bash v: 5.1.16 running-in: konsole inxi: 3.3.25

y la salida de la actualización:

Preparando...
Sincronización de bases de datos de paquetes...
Actualizando AUR...
Resolviendo dependencias...
comprobando conflictos internos...
Descarga de linux61-nvidia (530.41.03-11) iniciada
Descarga de manjaro-release (22.1.3-1) iniciada
Descarga de manjaro-release (22.1.3-1) finalizada
Descarga de linux61 (6.1.30-1) iniciada
Descarga de linux61-nvidia (530.41.03-11) finalizada
Descarga de gtksourceview4 (4.8.4-1) iniciada
Descarga de gtksourceview4 (4.8.4-1) finalizada
Descarga de meld (3.22.0-1) iniciada
Descarga de meld (3.22.0-1) finalizada
Descarga de linux61 (6.1.30-1) finalizada
Comprobando llavero...
Comprobando integridad...
Cargando archivos de los paquetes...
Comprobando conflictos entre archivos...
Comprobando espacio disponible en disco...
Ejecutando hooks de pre-transacción...
Creating Timeshift snapshot before upgrade...
==> skipping timeshift-autosnap due skipRsyncAutosnap in /etc/timeshift-autosnap.conf set to TRUE.
Removing linux initcpios...
Actualizando linux61 (6.1.29-1 -> 6.1.30-1)...
Actualizando linux61-nvidia (530.41.03-10 -> 530.41.03-11)...
Actualizando manjaro-release (22.1.2-1 -> 22.1.3-1)...
Instalando gtksourceview4 (4.8.4-1)...
Instalando meld (3.22.0-1)...
Ejecutando hooks de post-transacción...
Arming ConditionNeedsUpdate...
Updating the MIME type database...
Updating module dependencies...
Updating linux initcpios...
==> Building image from preset: /etc/mkinitcpio.d/linux61.preset: 'default'
  -> -k /boot/vmlinuz-6.1-x86_64 -c /etc/mkinitcpio.conf -g /boot/initramfs-6.1-x86_64.img --microcode /boot/amd-ucode.img
==> Starting build: '6.1.30-1-MANJARO'
  -> Running build hook: [base]
  -> Running build hook: [udev]
  -> Running build hook: [autodetect]
  -> Running build hook: [modconf]
  -> Running build hook: [block]
==> WARNING: Possibly missing firmware for module: 'xhci_pci'
  -> Running build hook: [keyboard]
  -> Running build hook: [keymap]
  -> Running build hook: [consolefont]
==> WARNING: consolefont: no font found in configuration
  -> Running build hook: [plymouth]
  -> Running build hook: [filesystems]
  -> Running build hook: [fsck]
==> Generating module dependencies
==> Creating gzip-compressed initcpio image: '/boot/initramfs-6.1-x86_64.img'
==> Image generation successful
==> Building image from preset: /etc/mkinitcpio.d/linux61.preset: 'fallback'
  -> -k /boot/vmlinuz-6.1-x86_64 -c /etc/mkinitcpio.conf -g /boot/initramfs-6.1-x86_64-fallback.img -S autodetect --microcode /boot/amd-ucode.img
==> Starting build: '6.1.30-1-MANJARO'
  -> Running build hook: [base]
  -> Running build hook: [udev]
  -> Running build hook: [modconf]
  -> Running build hook: [block]
==> WARNING: Possibly missing firmware for module: 'qla1280'
==> WARNING: Possibly missing firmware for module: 'bfa'
==> WARNING: Possibly missing firmware for module: 'qed'
==> WARNING: Possibly missing firmware for module: 'wd719x'
==> WARNING: Possibly missing firmware for module: 'qla2xxx'
==> WARNING: Possibly missing firmware for module: 'aic94xx'
==> WARNING: Possibly missing firmware for module: 'xhci_pci'
  -> Running build hook: [keyboard]
  -> Running build hook: [keymap]
  -> Running build hook: [consolefont]
==> WARNING: consolefont: no font found in configuration
  -> Running build hook: [plymouth]
  -> Running build hook: [filesystems]
  -> Running build hook: [fsck]
==> Generating module dependencies
==> Creating gzip-compressed initcpio image: '/boot/initramfs-6.1-x86_64-fallback.img'
==> Image generation successful
Updating Kernel initcpios for Nvidia-DRM...
Refreshing PackageKit...
Updating Grub-Bootmenu
Generando un fichero de configuración de grub...
Encontrado tema: /usr/share/grub/themes/manjaro/theme.txt
Encontrada imagen de linux: /boot/vmlinuz-6.1-x86_64
Encontrada imagen de memoria inicial: /boot/amd-ucode.img /boot/initramfs-6.1-x86_64.img
Found initrd fallback image: /boot/initramfs-6.1-x86_64-fallback.img
Aviso: os-prober will be executed to detect other bootable partitions.
Its output will be used to detect bootable binaries on them and create new boot entries.
Encontrado Windows Boot Manager en /dev/nvme1n1p1@/efi/Microsoft/Boot/bootmgfw.efi
Encontrado Manjaro Linux (22.1.2) en /dev/sda3
Encontrado Manjaro Linux (22.1.1) en /dev/sdb4
Adding boot menu entry for UEFI Firmware Settings ...
Root filesystem isn't btrfs
If you think an error has occurred, please file a bug report at "https://github.com/Antynea/grub-btrfs"
Found memtest86+ image: /boot/memtest86+/memtest.bin
/usr/bin/grub-probe: aviso: tipo de dispositivo nvme0n1 desconocido.
Found memtest86+ EFI image: /boot/memtest86+/memtest.efi
/usr/bin/grub-probe: aviso: tipo de dispositivo nvme0n1 desconocido.
hecho
Compiling GSettings XML schema files...
Updating icon theme caches...
Updating the desktop file MIME type cache...
Se necesita un reinicio para que los cambios tengan efecto.
Transacción terminada con éxito.

por si alguien sabe dónde puede estar el erro.
Muchas gracias.

Hombre, haz lo que creas conveniente, pero yo por lo menos intentaría encontrar primero el origen del problema.
Es un problema de arranque/grub porque te ha fastidiado el arranque de los 3 sistemas. Lo primero es saber si grub carga. Teniendo 3 sistemas, diría que siempre te debe salir el menú de grub, pero pregunto por si acaso… ¿te sale? Si no sale automáticamente, ¿te sale si pulsas la tecla Escape después del POST (arranque BIOS)?

Arranca desde un liveUSB de Manjaro, y muestra la salida de la orden:

sudo efibootmgr -v

Muestra también la salida de:

sudo fdisk -l
lsblk -f

También puedes intentar arrancar tus Manjaros desde el liveUSB. En el menu grub del liveUSB hay una opción para detectar y arrancar entradas EFI. Prueba a ver si te funciona

puedes recuperar el grub con un manjaro usb , recupéralo para el principal M.2, hay varias guías y es sencillo si luego hacer la guía algo no te funciona, desconectalo los otros 2 discos y volvé a recuperar, y luego los conectas y booteas seleccionando el M2 no, los otros.

Hola.
Probé a volver a instalar manjaro en el disco ssd y sigue como antes: no arranca. No sale menú de grub, ni con Escape. Instalé Kubuntu y sin problemas: arranca a la primera. Le puse la opción automática e instaló el sistema en el ssd sda y el cargador en el M.2 nvme0n1.

Añado las salidas de los dos comandos.

sudo fdisk -l

Disk /dev/loop0: 4 KiB, 4096 bytes, 8 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/loop1: 72,99 MiB, 76537856 bytes, 149488 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/loop2: 242,15 MiB, 253915136 bytes, 495928 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/loop3: 460,39 MiB, 482750464 bytes, 942872 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/loop4: 91,69 MiB, 96141312 bytes, 187776 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/loop5: 49,84 MiB, 52260864 bytes, 102072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/nvme1n1: 931,51 GiB, 1000204886016 bytes, 1953525168 sectors
Disk model: KIOXIA-EXCERIA SSD                      
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: B507FAD4-1372-476E-AFC6-89363F8F1E1E

Device              Start        End    Sectors   Size Type
/dev/nvme1n1p1       2048     206847     204800   100M EFI System
/dev/nvme1n1p2     206848     239615      32768    16M Microsoft reserved
/dev/nvme1n1p3     239616 1848150067 1847910452 881,2G Microsoft basic data
/dev/nvme1n1p4 1848152064 1849337855    1185792   579M Windows recovery environment
/dev/nvme1n1p5 1849339904 1951883263  102543360  48,9G Microsoft basic data
/dev/nvme1n1p6 1951897500 1953520063    1622564 792,3M Microsoft basic data


Disk /dev/nvme0n1: 931,51 GiB, 1000204886016 bytes, 1953525168 sectors
Disk model: KINGSTON SNV2S1000G                     
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 9F1387B4-B56B-43E1-8D0E-13ED23FB0F84

Device             Start        End    Sectors   Size Type
/dev/nvme0n1p1      2048     104447     102400    50M Linux filesystem
/dev/nvme0n1p2    104448    1128447    1024000   500M EFI System
/dev/nvme0n1p3   1128448  526067711  524939264 250,3G Linux filesystem
/dev/nvme0n1p4 526067712 1953525134 1427457423 680,7G Linux filesystem


Disk /dev/sda: 447,13 GiB, 480103981056 bytes, 937703088 sectors
Disk model: KINGSTON SA400S3
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 9C3F7800-2828-475D-8380-9E5ED71F1B75

Device       Start       End   Sectors   Size Type
/dev/sda1     2048   1050623   1048576   512M EFI System
/dev/sda2  1050624 937701375 936650752 446,6G Linux filesystem


Disk /dev/sdb: 7,28 TiB, 8001563222016 bytes, 15628053168 sectors
Disk model: ST8000DM004-2CX1
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 8C1B1106-E3B7-4A70-907B-66E9F228E04C

Device         Start         End     Sectors  Size Type
/dev/sdb2  204816384 15628052479 15423236096  7,2T Linux filesystem


Disk /dev/sdc: 2,73 TiB, 3000592982016 bytes, 5860533168 sectors
Disk model: WDC WD30EZRX-00D
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 21E404B2-76DC-4B63-A34A-7F13DD8D1F97

Device          Start        End    Sectors   Size Type
/dev/sdc1  4631732224 5860532223 1228800000 585,9G Microsoft basic data
/dev/sdc2        2048 4631732223 4631730176   2,2T Linux filesystem

Partition table entries are not in disk order.


Disk /dev/sdd: 2,73 TiB, 3000592982016 bytes, 5860533168 sectors
Disk model: TOSHIBA HDWD130 
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: F119BE9F-0381-234C-B105-6C51953D6197

Device     Start        End    Sectors  Size Type
/dev/sdd1   2048 5860532223 5860530176  2,7T Linux filesystem


Disk /dev/sde: 1,82 TiB, 2000398934016 bytes, 3907029168 sectors
Disk model: TOSHIBA HDWD120 
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 643BDC1C-9A71-4906-9AEB-B4B04BF12401

Device     Start        End    Sectors  Size Type
/dev/sde1   2048 3907028991 3907026944  1,8T Linux filesystem


Disk /dev/sdf: 2,73 TiB, 3000592982016 bytes, 5860533168 sectors
Disk model: WDC WD30EZRX-00D
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 20CC2B2B-B124-4021-8C5E-C8AA5E1084FB

Device     Start        End    Sectors  Size Type
/dev/sdf1   2048 5860532223 5860530176  2,7T Microsoft basic data

lsblk -f

NAME        FSTYPE FSVER LABEL       UUID                                 FSAVAIL FSUSE% MOUNTPOINTS
loop0                                                                           0   100% /snap/bare/5
loop1                                                                           0   100% /snap/core22/607
loop2                                                                           0   100% /snap/firefox/2517
loop3                                                                           0   100% /snap/gnome-42-2204/68
loop4                                                                           0   100% /snap/gtk-common-themes/1535
loop5                                                                           0   100% /snap/snapd/18596
sda                                                                                      
├─sda1      vfat   FAT32             6D8C-8BEE                                           
└─sda2      ext4   1.0               15c163c1-c782-4702-8d66-2c5cac230a93  404,8G     3% /var/snap/firefox/common/host-hunspell
                                                                                         /
sdb                                                                                      
└─sdb2      ext4   1.0   Seagate_8TB 3e40a535-0ca4-49a5-8145-76d5ddc9a646                
sdc                                                                                      
├─sdc1      ntfs         Win_backup  60FB65ED21E3222B                                    
└─sdc2      ext4   1.0   WD30EZRX    d3dcc880-113c-4c16-a7ce-c49edb490952                
sdd                                                                                      
└─sdd1      ext4   1.0   P300        d77d3751-db4c-4421-b1f8-2f6ed0af35fa                
sde                                                                                      
└─sde1      ext4   1.0   HDWD120     c2a1df10-3b8c-49fc-92a3-bc3738a03079                
sdf                                                                                      
└─sdf1      ext4   1.0   WD30EZRX_1  a514fe88-1a84-4d41-87f4-ce5a942930ba                
sr0                                                                                      
nvme1n1                                                                                  
├─nvme1n1p1 vfat   FAT32             7854-2CB1                                           
├─nvme1n1p2                                                                              
├─nvme1n1p3 ntfs                     5AA454D7A454B6EB                                    
├─nvme1n1p4 ntfs                     6294627F94625617                                    
├─nvme1n1p5 ntfs         RECOVERY    5E18BF8918BF5F29                                    
└─nvme1n1p6 vfat   FAT32 AOMEI       10AA-1782                                           
nvme0n1                                                                                  
├─nvme0n1p1                                                                              
├─nvme0n1p2 vfat   FAT32             A31D-33CC                             492,8M     1% /boot/efi
├─nvme0n1p3 ext4   1.0               a2858919-6eaa-4af2-b465-00627d547b21                
└─nvme0n1p4 ext4   1.0   Home_NVMe   70f8bbd2-91f3-4ff3-a15a-78fe48e87c0f    

Gracias

Faltó poner la salida de:

sudo efibootmgr -v

la salida es ésta:

ootCurrent: 0013
Timeout: 1 seconds
BootOrder: 0002,0013,0000,0001,0004,0014
Boot0000* Windows Boot Manager  HD(1,GPT,147b0d8a-220b-428c-b265-30dccfc1ad2c,0x800,0x32000)/File(\EFI\MICROSOFT\BOOT\BOOTMGFW.EFI)WINDOWS.........x...B.C.D.O.B.J.E.C.T.=.{.9.d.e.a.8.6.2.c.-.5.c.d.d.-.4.e.7.0.-.a.c.c.1.-.f.3.2.b.3.4.4.d.4.7.9.5.}...a................
Boot0001* ubuntu        HD(2,GPT,2508f923-261f-4f0f-ab4b-6723d8a112e2,0x19800,0xfa000)/File(\EFI\UBUNTU\SHIMX64.EFI)
Boot0002* ubuntu        HD(2,GPT,2508f923-261f-4f0f-ab4b-6723d8a112e2,0x19800,0xfa000)/File(\EFI\ubuntu\shimx64.efi)
Boot0004  Hard Drive    BBS(HD,,0x0)/VenHw(5ce8128b-2cec-40f0-8372-80640e3dc858,0200)..GO..NO..........K.I.N.G.S.T.O.N. .S.A.4.0.0.S.3.7.4.8.0.G...................\.,.@.r.d.=.X..........A.............................................>..Gd-.;.A..MQ..L.0.5.2.0.B.6.6.7.2.8.6.8.A.0.F.6. . . . ........BO..NO..........K.I.N.G.S.T.O.N. .S.N.V.2.S.1.0.0.0.G...................\.,.@.r.d.=.X..........A...........................&.hc........6..Gd-.;.A..MQ..L.5.0.0.2.6.B.7.6.8.6.3.1.1.B.2.F........BO..NO..........K.I.O.X.I.A.-.E.X.C.E.R.I.A. .S.S.D...................\.,.@.r.d.=.X..........A...........................................f.}........Gd-.;.A..MQ..L.4.1.N.A.2.3.K.Q.K.2.U.2........BO..NO..........S.0. .W.D.C. .W.D.3.0.E.Z.R.X.-.0.0.D.8.P.B.0...................\.,.@.r.d.=.X..........A....................................1.N........>.;......D..Gd-.;.A..MQ..L.S.0. .W.D.C. .W.D.3.0.E.Z.R.X.-.0.0.D.8.P.B.0........BO..NO..........S.T.8.0.0.0.D.M.0.0.4.-.2.C.X.1.8.8...................\.,.@.r.d.=.X..........A.............................................>..Gd-.;.A..MQ..L. . . . . . . . . . . . .C.Z.2.T.T.R.L.W........BO..NO..........T.O.S.H.I.B.A. .H.D.W.D.1.3.0...................\.,.@.r.d.=.X..........A.............................................>..Gd-.;.A..MQ..L. . . . . . . . . . .7. .T.9.3.D.P.Y.S.A........BO..NO..........T.O.S.H.I.B.A. .H.D.W.D.1.2.0...................\.,.@.r.d.=.X..........A.............................................>..Gd-.;.A..MQ..L. . . . . . . . . . .8. .2.9.U.B.R.3.S.C........BO..NO..........W.D.C. .W.D.3.0.E.Z.R.X.-.0.0.D.C.0.B.0...................\.,.@.r.d.=.X..........A.............................................>..Gd-.;.A..MQ..L. . . . .W. .-.D.M.W.1.C.1.T.1.1.1.0.9.1........BO
Boot0013* UEFI OS       HD(2,GPT,2508f923-261f-4f0f-ab4b-6723d8a112e2,0x19800,0xfa000)/File(\EFI\BOOT\BOOTX64.EFI)..BO
Boot0014  CD/DVD Drive  BBS(CDROM,,0x0)/VenHw(5ce8128b-2cec-40f0-8372-80640e3dc858,0300)..GO..NO..........H.L.-.D.T.-.S.T. .D.V.D.R.A.M. .G.H.2.4.N.S.D.1...................\.,.@.r.d.=.X..........A.............................................>..Gd-.;.A..MQ..L.1.K.H.2.5.1.2.9.0.9. .9. . . . . . . . ........BO

aunque no creo que sea como la original ya que instalé el Kubuntu y en su grub no aparece Manjaro.

Cuando tienes Manjaro y otras distros Linux, el grub ha de ser el de Manjaro. Al revés no funciona.

Y encima, como comentas, no hay ninguna entrada para Manjaro en esa lista, así que lo que está claro es que Manjaro no va a arrancar en ningún caso.

Según la salida de efibootmgr, tu sistema está configurado para arrancar primero el grub que se encuentra en el disco 2 UUID 2508f923-261f-4f0f-ab4b-6723d8a112e2 (la entrada 0002). Si no te sale grub es que hay algún problema con ese grub. De todas formas parece que la entrada que había arrancado en ese momento es la número 13 (no se si lo hiciste de forma manual o es que la entrada número 2 no funcionó y saltó a la 13).

Si quieres recuperar el grub de Manjaro, tendrás que entrar con un liveUSB de Manjaro y recuperar el grub de tu sistema. Hay unos cuantos tutoriales/guías de cómo hacerlo en el foro o por internet en general. Pero pregunta si tienes dudas antes de hacer nada de lo que no estés seguro.

Hola.
No sé lo que hice ahora pero volví a instalar Manjaro en el nvme0n1 y funciona. Lo que he observado es que cuando en el instalador llega el momento de instalar el grub si tarda como 10 minutos en hacerlo es cuando no va arrancar el sistema, si tarda (como ahora) menos de 1 minuto, entonces arranca.

Ahora tengo esta salida para sudo efibootmgr -v

BootCurrent: 0016
Timeout: 1 seconds
BootOrder: 0016,0000,0001,0004,0014
Boot0000* Windows Boot Manager  HD(1,GPT,147b0d8a-220b-428c-b265-30dccfc1ad2c,0x800,0x32000)/File(\EFI\MICROSOFT\BOOT\BOOTMGFW.EFI)57494e444f5753000100000088000000780000004200430044004f0042004a004500430054003d007b00390064006500610038003600320063002d0035006300640064002d0034006500370030002d0061006300630031002d006600330032006200330034003400640034003700390035007d00000061000100000010000000040000007fff0400
      dp: 04 01 2a 00 01 00 00 00 00 08 00 00 00 00 00 00 00 20 03 00 00 00 00 00 8a 0d 7b 14 0b 22 8c 42 b2 65 30 dc cf c1 ad 2c 02 02 / 04 04 46 00 5c 00 45 00 46 00 49 00 5c 00 4d 00 49 00 43 00 52 00 4f 00 53 00 4f 00 46 00 54 00 5c 00 42 00 4f 00 4f 00 54 00 5c 00 42 00 4f 00 4f 00 54 00 4d 00 47 00 46 00 57 00 2e 00 45 00 46 00 49 00 00 00 / 7f ff 04 00
    data: 57 49 4e 44 4f 57 53 00 01 00 00 00 88 00 00 00 78 00 00 00 42 00 43 00 44 00 4f 00 42 00 4a 00 45 00 43 00 54 00 3d 00 7b 00 39 00 64 00 65 00 61 00 38 00 36 00 32 00 63 00 2d 00 35 00 63 00 64 00 64 00 2d 00 34 00 65 00 37 00 30 00 2d 00 61 00 63 00 63 00 31 00 2d 00 66 00 33 00 32 00 62 00 33 00 34 00 34 00 64 00 34 00 37 00 39 00 35 00 7d 00 00 00 61 00 01 00 00 00 10 00 00 00 04 00 00 00 7f ff 04 00
Boot0001* Manjaro       HD(2,GPT,c8445ae8-33d9-43e6-a38d-bb5329f74b02,0x19800,0xfa000)/File(\EFI\MANJARO\GRUBX64.EFI)
      dp: 04 01 2a 00 02 00 00 00 00 98 01 00 00 00 00 00 00 a0 0f 00 00 00 00 00 e8 5a 44 c8 d9 33 e6 43 a3 8d bb 53 29 f7 4b 02 02 02 / 04 04 36 00 5c 00 45 00 46 00 49 00 5c 00 4d 00 41 00 4e 00 4a 00 41 00 52 00 4f 00 5c 00 47 00 52 00 55 00 42 00 58 00 36 00 34 00 2e 00 45 00 46 00 49 00 00 00 / 7f ff 04 00
Boot0004  Hard Drive    BBS(HD,,0x0)/VenHw(5ce8128b-2cec-40f0-8372-80640e3dc858,0200)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
      dp: 05 01 09 00 02 00 00 00 00 / 01 04 16 00 8b 12 e8 5c ec 2c f0 40 83 72 80 64 0e 3d c8 58 02 00 / 7f ff 04 00
    data: 00 00 47 4f 00 00 4e 4f d5 00 00 00 08 00 00 00 97 00 4b 00 49 00 4e 00 47 00 53 00 54 00 4f 00 4e 00 20 00 53 00 41 00 34 00 30 00 30 00 53 00 33 00 37 00 34 00 38 00 30 00 47 00 00 00 05 01 09 00 02 00 00 00 00 01 04 16 00 8b 12 e8 5c ec 2c f0 40 83 72 80 64 0e 3d c8 58 02 00 7f ff 04 00 02 01 0c 00 d0 41 03 0a 00 00 00 00 01 01 06 00 02 01 01 01 06 00 00 00 01 01 06 00 00 04 01 01 06 00 00 00 03 12 0a 00 00 00 ff ff 00 00 7f ff 04 00 01 04 3e 00 ef 47 64 2d c9 3b a0 41 ac 19 4d 51 d0 1b 4c e6 30 00 35 00 32 00 30 00 42 00 36 00 36 00 37 00 32 00 38 00 36 00 38 00 41 00 30 00 46 00 36 00 20 00 20 00 20 00 20 00 00 00 7f ff 04 00 00 00 42 4f 00 00 4e 4f c3 00 00 00 08 00 00 00 89 00 4b 00 49 00 4e 00 47 00 53 00 54 00 4f 00 4e 00 20 00 53 00 4e 00 56 00 32 00 53 00 31 00 30 00 30 00 30 00 47 00 00 00 05 01 09 00 02 00 00 00 00 01 04 16 00 8b 12 e8 5c ec 2c f0 40 83 72 80 64 0e 3d c8 58 02 00 7f ff 04 00 02 01 0c 00 d0 41 03 0a 00 00 00 00 01 01 06 00 01 01 01 01 06 00 00 00 03 17 10 00 01 00 00 00 00 26 b7 68 63 11 b2 f5 7f ff 04 00 01 04 36 00 ef 47 64 2d c9 3b a0 41 ac 19 4d 51 d0 1b 4c e6 35 00 30 00 30 00 32 00 36 00 42 00 37 00 36 00 38 00 36 00 33 00 31 00 31 00 42 00 32 00 46 00 00 00 7f ff 04 00 00 00 42 4f 00 00 4e 4f c5 00 00 00 08 00 00 00 8d 00 4b 00 49 00 4f 00 58 00 49 00 41 00 2d 00 45 00 58 00 43 00 45 00 52 00 49 00 41 00 20 00 53 00 53 00 44 00 00 00 05 01 09 00 02 00 00 00 00 01 04 16 00 8b 12 e8 5c ec 2c f0 40 83 72 80 64 0e 3d c8 58 02 00 7f ff 04 00 02 01 0c 00 d0 41 03 0a 00 00 00 00 01 01 06 00 02 01 01 01 06 00 00 00 01 01 06 00 00 00 01 01 06 00 00 00 03 17 10 00 01 00 00 00 8c e3 8e 03 00 66 c8 7d 7f ff 04 00 01 04 2e 00 ef 47 64 2d c9 3b a0 41 ac 19 4d 51 d0 1b 4c e6 34 00 31 00 4e 00 41 00 32 00 33 00 4b 00 51 00 4b 00 32 00 55 00 32 00 00 00 7f ff 04 00 00 00 42 4f 00 00 4e 4f ea 00 00 00 08 00 00 00 a8 00 53 00 30 00 20 00 57 00 44 00 43 00 20 00 57 00 44 00 33 00 30 00 45 00 5a 00 52 00 58 00 2d 00 30 00 30 00 44 00 38 00 50 00 42 00 30 00 00 00 05 01 09 00 02 00 00 00 00 01 04 16 00 8b 12 e8 5c ec 2c f0 40 83 72 80 64 0e 3d c8 58 02 00 7f ff 04 00 02 01 0c 00 d0 41 03 0a 00 00 00 00 01 01 06 00 02 01 01 01 06 00 00 00 01 01 06 00 00 07 01 01 06 00 00 00 01 04 15 00 c5 fa 31 cf 4e c2 d2 11 85 f3 00 a0 c9 3e c9 3b 80 7f ff 04 00 01 04 44 00 ef 47 64 2d c9 3b a0 41 ac 19 4d 51 d0 1b 4c e6 53 00 30 00 20 00 57 00 44 00 43 00 20 00 57 00 44 00 33 00 30 00 45 00 5a 00 52 00 58 00 2d 00 30 00 30 00 44 00 38 00 50 00 42 00 30 00 00 00 7f ff 04 00 00 00 42 4f 00 00 4e 4f cf 00 00 00 08 00 00 00 97 00 53 00 54 00 38 00 30 00 30 00 30 00 44 00 4d 00 30 00 30 00 34 00 2d 00 32 00 43 00 58 00 31 00 38 00 38 00 00 00 05 01 09 00 02 00 00 00 00 01 04 16 00 8b 12 e8 5c ec 2c f0 40 83 72 80 64 0e 3d c8 58 02 00 7f ff 04 00 02 01 0c 00 d0 41 03 0a 00 00 00 00 01 01 06 00 02 01 01 01 06 00 00 00 01 01 06 00 00 04 01 01 06 00 00 00 03 12 0a 00 01 00 ff ff 00 00 7f ff 04 00 01 04 3e 00 ef 47 64 2d c9 3b a0 41 ac 19 4d 51 d0 1b 4c e6 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 43 00 5a 00 32 00 54 00 54 00 52 00 4c 00 57 00 00 00 7f ff 04 00 00 00 42 4f 00 00 4e 4f c9 00 00 00 08 00 00 00 97 00 54 00 4f 00 53 00 48 00 49 00 42 00 41 00 20 00 48 00 44 00 57 00 44 00 31 00 33 00 30 00 00 00 05 01 09 00 02 00 00 00 00 01 04 16 00 8b 12 e8 5c ec 2c f0 40 83 72 80 64 0e 3d c8 58 02 00 7f ff 04 00 02 01 0c 00 d0 41 03 0a 00 00 00 00 01 01 06 00 02 01 01 01 06 00 00 00 01 01 06 00 00 0a 01 01 06 00 00 00 03 12 0a 00 01 00 ff ff 00 00 7f ff 04 00 01 04 3e 00 ef 47 64 2d c9 3b a0 41 ac 19 4d 51 d0 1b 4c e6 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 37 00 20 00 54 00 39 00 33 00 44 00 50 00 59 00 53 00 41 00 00 00 7f ff 04 00 00 00 42 4f 00 00 4e 4f c9 00 00 00 08 00 00 00 97 00 54 00 4f 00 53 00 48 00 49 00 42 00 41 00 20 00 48 00 44 00 57 00 44 00 31 00 32 00 30 00 00 00 05 01 09 00 02 00 00 00 00 01 04 16 00 8b 12 e8 5c ec 2c f0 40 83 72 80 64 0e 3d c8 58 02 00 7f ff 04 00 02 01 0c 00 d0 41 03 0a 00 00 00 00 01 01 06 00 02 01 01 01 06 00 00 00 01 01 06 00 00 0a 01 01 06 00 00 00 03 12 0a 00 04 00 ff ff 00 00 7f ff 04 00 01 04 3e 00 ef 47 64 2d c9 3b a0 41 ac 19 4d 51 d0 1b 4c e6 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 38 00 20 00 32 00 39 00 55 00 42 00 52 00 33 00 53 00 43 00 00 00 7f ff 04 00 00 00 42 4f 00 00 4e 4f d3 00 00 00 08 00 00 00 97 00 57 00 44 00 43 00 20 00 57 00 44 00 33 00 30 00 45 00 5a 00 52 00 58 00 2d 00 30 00 30 00 44 00 43 00 30 00 42 00 30 00 00 00 05 01 09 00 02 00 00 00 00 01 04 16 00 8b 12 e8 5c ec 2c f0 40 83 72 80 64 0e 3d c8 58 02 00 7f ff 04 00 02 01 0c 00 d0 41 03 0a 00 00 00 00 01 01 06 00 02 01 01 01 06 00 00 00 01 01 06 00 00 0a 01 01 06 00 00 00 03 12 0a 00 05 00 ff ff 00 00 7f ff 04 00 01 04 3e 00 ef 47 64 2d c9 3b a0 41 ac 19 4d 51 d0 1b 4c e6 20 00 20 00 20 00 20 00 57 00 20 00 2d 00 44 00 4d 00 57 00 31 00 43 00 31 00 54 00 31 00 31 00 31 00 30 00 39 00 31 00 00 00 7f ff 04 00 00 00 42 4f
Boot0014  CD/DVD Drive  BBS(CDROM,,0x0)/VenHw(5ce8128b-2cec-40f0-8372-80640e3dc858,0300)0000474f00004e4fdb00000008000000970048004c002d00440054002d00530054002000440056004400520041004d00200047004800320034004e005300440031000000050109000300000000010416008b12e85cec2cf040837280640e3dc85803007fff040002010c00d041030a0000000001010600020101010600000001010600000a01010600000003120a000000ffff00007fff040001043e00ef47642dc93ba041ac194d51d01b4ce631004b0048003200350031003200390030003900200039002000200020002000200020002000200000007fff04000000424f
      dp: 05 01 09 00 03 00 00 00 00 / 01 04 16 00 8b 12 e8 5c ec 2c f0 40 83 72 80 64 0e 3d c8 58 03 00 / 7f ff 04 00
    data: 00 00 47 4f 00 00 4e 4f db 00 00 00 08 00 00 00 97 00 48 00 4c 00 2d 00 44 00 54 00 2d 00 53 00 54 00 20 00 44 00 56 00 44 00 52 00 41 00 4d 00 20 00 47 00 48 00 32 00 34 00 4e 00 53 00 44 00 31 00 00 00 05 01 09 00 03 00 00 00 00 01 04 16 00 8b 12 e8 5c ec 2c f0 40 83 72 80 64 0e 3d c8 58 03 00 7f ff 04 00 02 01 0c 00 d0 41 03 0a 00 00 00 00 01 01 06 00 02 01 01 01 06 00 00 00 01 01 06 00 00 0a 01 01 06 00 00 00 03 12 0a 00 00 00 ff ff 00 00 7f ff 04 00 01 04 3e 00 ef 47 64 2d c9 3b a0 41 ac 19 4d 51 d0 1b 4c e6 31 00 4b 00 48 00 32 00 35 00 31 00 32 00 39 00 30 00 39 00 20 00 39 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 00 00 7f ff 04 00 00 00 42 4f
Boot0016* UEFI OS       HD(2,GPT,c8445ae8-33d9-43e6-a38d-bb5329f74b02,0x19800,0xfa000)/File(\EFI\BOOT\BOOTX64.EFI)0000424f
      dp: 04 01 2a 00 02 00 00 00 00 98 01 00 00 00 00 00 00 a0 0f 00 00 00 00 00 e8 5a 44 c8 d9 33 e6 43 a3 8d bb 53 29 f7 4b 02 02 02 / 04 04 30 00 5c 00 45 00 46 00 49 00 5c 00 42 00 4f 00 4f 00 54 00 5c 00 42 00 4f 00 4f 00 54 00 58 00 36 00 34 00 2e 00 45 00 46 00 49 00 00 00 / 7f ff 04 00
    data: 00 00 42 4f

Muchas gracias

Ahora está usando la entrada de “UEFI OS”. Podrías cambiar el orden de arranque para que (aunque en el fondo sea lo mismo) arranque la entrada marcada como Manjaro.

Para ello ejecuta:

sudo efibootmgr -o 1,0,16,4,14

Como instalé kubuntu en el disco sda, la salida del comando sale un poco distinta a la anterior pero con manjaro ya de primero en el arranque.

BootCurrent: 0001
Timeout: 1 seconds
BootOrder: 0001,0000,0002,0016,0004,0014
Boot0000* Windows Boot Manager  HD(1,GPT,147b0d8a-220b-428c-b265-30dccfc1ad2c,0x800,0x32000)/File(\EFI\MICROSOFT\BOOT\BOOTMGFW.EFI)57494e444f5753000100000088000000780000004200430044004f0042004a004500430054003d007b00390064006500610038003600320063002d0035006300640064002d0034006500370030002d0061006300630031002d006600330032006200330034003400640034003700390035007d00000061000100000010000000040000007fff0400
      dp: 04 01 2a 00 01 00 00 00 00 08 00 00 00 00 00 00 00 20 03 00 00 00 00 00 8a 0d 7b 14 0b 22 8c 42 b2 65 30 dc cf c1 ad 2c 02 02 / 04 04 46 00 5c 00 45 00 46 00 49 00 5c 00 4d 00 49 00 43 00 52 00 4f 00 53 00 4f 00 46 00 54 00 5c 00 42 00 4f 00 4f 00 54 00 5c 00 42 00 4f 00 4f 00 54 00 4d 00 47 00 46 00 57 00 2e 00 45 00 46 00 49 00 00 00 / 7f ff 04 00
    data: 57 49 4e 44 4f 57 53 00 01 00 00 00 88 00 00 00 78 00 00 00 42 00 43 00 44 00 4f 00 42 00 4a 00 45 00 43 00 54 00 3d 00 7b 00 39 00 64 00 65 00 61 00 38 00 36 00 32 00 63 00 2d 00 35 00 63 00 64 00 64 00 2d 00 34 00 65 00 37 00 30 00 2d 00 61 00 63 00 63 00 31 00 2d 00 66 00 33 00 32 00 62 00 33 00 34 00 34 00 64 00 34 00 37 00 39 00 35 00 7d 00 00 00 61 00 01 00 00 00 10 00 00 00 04 00 00 00 7f ff 04 00
Boot0001* Manjaro       HD(2,GPT,c8445ae8-33d9-43e6-a38d-bb5329f74b02,0x19800,0xfa000)/File(\EFI\MANJARO\GRUBX64.EFI)
      dp: 04 01 2a 00 02 00 00 00 00 98 01 00 00 00 00 00 00 a0 0f 00 00 00 00 00 e8 5a 44 c8 d9 33 e6 43 a3 8d bb 53 29 f7 4b 02 02 02 / 04 04 36 00 5c 00 45 00 46 00 49 00 5c 00 4d 00 41 00 4e 00 4a 00 41 00 52 00 4f 00 5c 00 47 00 52 00 55 00 42 00 58 00 36 00 34 00 2e 00 45 00 46 00 49 00 00 00 / 7f ff 04 00
Boot0002* ubuntu        HD(2,GPT,c8445ae8-33d9-43e6-a38d-bb5329f74b02,0x19800,0xfa000)/File(\EFI\UBUNTU\SHIMX64.EFI)
      dp: 04 01 2a 00 02 00 00 00 00 98 01 00 00 00 00 00 00 a0 0f 00 00 00 00 00 e8 5a 44 c8 d9 33 e6 43 a3 8d bb 53 29 f7 4b 02 02 02 / 04 04 34 00 5c 00 45 00 46 00 49 00 5c 00 55 00 42 00 55 00 4e 00 54 00 55 00 5c 00 53 00 48 00 49 00 4d 00 58 00 36 00 34 00 2e 00 45 00 46 00 49 00 00 00 / 7f ff 04 00
Boot0004  Hard Drive    BBS(HD,,0x0)/VenHw(5ce8128b-2cec-40f0-8372-80640e3dc858,0200)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
      dp: 05 01 09 00 02 00 00 00 00 / 01 04 16 00 8b 12 e8 5c ec 2c f0 40 83 72 80 64 0e 3d c8 58 02 00 / 7f ff 04 00
    data: 00 00 47 4f 00 00 4e 4f d5 00 00 00 08 00 00 00 97 00 4b 00 49 00 4e 00 47 00 53 00 54 00 4f 00 4e 00 20 00 53 00 41 00 34 00 30 00 30 00 53 00 33 00 37 00 34 00 38 00 30 00 47 00 00 00 05 01 09 00 02 00 00 00 00 01 04 16 00 8b 12 e8 5c ec 2c f0 40 83 72 80 64 0e 3d c8 58 02 00 7f ff 04 00 02 01 0c 00 d0 41 03 0a 00 00 00 00 01 01 06 00 02 01 01 01 06 00 00 00 01 01 06 00 00 04 01 01 06 00 00 00 03 12 0a 00 00 00 ff ff 00 00 7f ff 04 00 01 04 3e 00 ef 47 64 2d c9 3b a0 41 ac 19 4d 51 d0 1b 4c e6 30 00 35 00 32 00 30 00 42 00 36 00 36 00 37 00 32 00 38 00 36 00 38 00 41 00 30 00 46 00 36 00 20 00 20 00 20 00 20 00 00 00 7f ff 04 00 00 00 42 4f 00 00 4e 4f c3 00 00 00 08 00 00 00 89 00 4b 00 49 00 4e 00 47 00 53 00 54 00 4f 00 4e 00 20 00 53 00 4e 00 56 00 32 00 53 00 31 00 30 00 30 00 30 00 47 00 00 00 05 01 09 00 02 00 00 00 00 01 04 16 00 8b 12 e8 5c ec 2c f0 40 83 72 80 64 0e 3d c8 58 02 00 7f ff 04 00 02 01 0c 00 d0 41 03 0a 00 00 00 00 01 01 06 00 01 01 01 01 06 00 00 00 03 17 10 00 01 00 00 00 00 26 b7 68 63 11 b2 f5 7f ff 04 00 01 04 36 00 ef 47 64 2d c9 3b a0 41 ac 19 4d 51 d0 1b 4c e6 35 00 30 00 30 00 32 00 36 00 42 00 37 00 36 00 38 00 36 00 33 00 31 00 31 00 42 00 32 00 46 00 00 00 7f ff 04 00 00 00 42 4f 00 00 4e 4f c5 00 00 00 08 00 00 00 8d 00 4b 00 49 00 4f 00 58 00 49 00 41 00 2d 00 45 00 58 00 43 00 45 00 52 00 49 00 41 00 20 00 53 00 53 00 44 00 00 00 05 01 09 00 02 00 00 00 00 01 04 16 00 8b 12 e8 5c ec 2c f0 40 83 72 80 64 0e 3d c8 58 02 00 7f ff 04 00 02 01 0c 00 d0 41 03 0a 00 00 00 00 01 01 06 00 02 01 01 01 06 00 00 00 01 01 06 00 00 00 01 01 06 00 00 00 03 17 10 00 01 00 00 00 8c e3 8e 03 00 66 c8 7d 7f ff 04 00 01 04 2e 00 ef 47 64 2d c9 3b a0 41 ac 19 4d 51 d0 1b 4c e6 34 00 31 00 4e 00 41 00 32 00 33 00 4b 00 51 00 4b 00 32 00 55 00 32 00 00 00 7f ff 04 00 00 00 42 4f 00 00 4e 4f ea 00 00 00 08 00 00 00 a8 00 53 00 30 00 20 00 57 00 44 00 43 00 20 00 57 00 44 00 33 00 30 00 45 00 5a 00 52 00 58 00 2d 00 30 00 30 00 44 00 38 00 50 00 42 00 30 00 00 00 05 01 09 00 02 00 00 00 00 01 04 16 00 8b 12 e8 5c ec 2c f0 40 83 72 80 64 0e 3d c8 58 02 00 7f ff 04 00 02 01 0c 00 d0 41 03 0a 00 00 00 00 01 01 06 00 02 01 01 01 06 00 00 00 01 01 06 00 00 07 01 01 06 00 00 00 01 04 15 00 c5 fa 31 cf 4e c2 d2 11 85 f3 00 a0 c9 3e c9 3b 80 7f ff 04 00 01 04 44 00 ef 47 64 2d c9 3b a0 41 ac 19 4d 51 d0 1b 4c e6 53 00 30 00 20 00 57 00 44 00 43 00 20 00 57 00 44 00 33 00 30 00 45 00 5a 00 52 00 58 00 2d 00 30 00 30 00 44 00 38 00 50 00 42 00 30 00 00 00 7f ff 04 00 00 00 42 4f 00 00 4e 4f cf 00 00 00 08 00 00 00 97 00 53 00 54 00 38 00 30 00 30 00 30 00 44 00 4d 00 30 00 30 00 34 00 2d 00 32 00 43 00 58 00 31 00 38 00 38 00 00 00 05 01 09 00 02 00 00 00 00 01 04 16 00 8b 12 e8 5c ec 2c f0 40 83 72 80 64 0e 3d c8 58 02 00 7f ff 04 00 02 01 0c 00 d0 41 03 0a 00 00 00 00 01 01 06 00 02 01 01 01 06 00 00 00 01 01 06 00 00 04 01 01 06 00 00 00 03 12 0a 00 01 00 ff ff 00 00 7f ff 04 00 01 04 3e 00 ef 47 64 2d c9 3b a0 41 ac 19 4d 51 d0 1b 4c e6 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 43 00 5a 00 32 00 54 00 54 00 52 00 4c 00 57 00 00 00 7f ff 04 00 00 00 42 4f 00 00 4e 4f c9 00 00 00 08 00 00 00 97 00 54 00 4f 00 53 00 48 00 49 00 42 00 41 00 20 00 48 00 44 00 57 00 44 00 31 00 33 00 30 00 00 00 05 01 09 00 02 00 00 00 00 01 04 16 00 8b 12 e8 5c ec 2c f0 40 83 72 80 64 0e 3d c8 58 02 00 7f ff 04 00 02 01 0c 00 d0 41 03 0a 00 00 00 00 01 01 06 00 02 01 01 01 06 00 00 00 01 01 06 00 00 0a 01 01 06 00 00 00 03 12 0a 00 01 00 ff ff 00 00 7f ff 04 00 01 04 3e 00 ef 47 64 2d c9 3b a0 41 ac 19 4d 51 d0 1b 4c e6 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 37 00 20 00 54 00 39 00 33 00 44 00 50 00 59 00 53 00 41 00 00 00 7f ff 04 00 00 00 42 4f 00 00 4e 4f c9 00 00 00 08 00 00 00 97 00 54 00 4f 00 53 00 48 00 49 00 42 00 41 00 20 00 48 00 44 00 57 00 44 00 31 00 32 00 30 00 00 00 05 01 09 00 02 00 00 00 00 01 04 16 00 8b 12 e8 5c ec 2c f0 40 83 72 80 64 0e 3d c8 58 02 00 7f ff 04 00 02 01 0c 00 d0 41 03 0a 00 00 00 00 01 01 06 00 02 01 01 01 06 00 00 00 01 01 06 00 00 0a 01 01 06 00 00 00 03 12 0a 00 04 00 ff ff 00 00 7f ff 04 00 01 04 3e 00 ef 47 64 2d c9 3b a0 41 ac 19 4d 51 d0 1b 4c e6 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 38 00 20 00 32 00 39 00 55 00 42 00 52 00 33 00 53 00 43 00 00 00 7f ff 04 00 00 00 42 4f 00 00 4e 4f d3 00 00 00 08 00 00 00 97 00 57 00 44 00 43 00 20 00 57 00 44 00 33 00 30 00 45 00 5a 00 52 00 58 00 2d 00 30 00 30 00 44 00 43 00 30 00 42 00 30 00 00 00 05 01 09 00 02 00 00 00 00 01 04 16 00 8b 12 e8 5c ec 2c f0 40 83 72 80 64 0e 3d c8 58 02 00 7f ff 04 00 02 01 0c 00 d0 41 03 0a 00 00 00 00 01 01 06 00 02 01 01 01 06 00 00 00 01 01 06 00 00 0a 01 01 06 00 00 00 03 12 0a 00 05 00 ff ff 00 00 7f ff 04 00 01 04 3e 00 ef 47 64 2d c9 3b a0 41 ac 19 4d 51 d0 1b 4c e6 20 00 20 00 20 00 20 00 57 00 20 00 2d 00 44 00 4d 00 57 00 31 00 43 00 31 00 54 00 31 00 31 00 31 00 30 00 39 00 31 00 00 00 7f ff 04 00 00 00 42 4f
Boot0014  CD/DVD Drive  BBS(CDROM,,0x0)/VenHw(5ce8128b-2cec-40f0-8372-80640e3dc858,0300)0000474f00004e4fdb00000008000000970048004c002d00440054002d00530054002000440056004400520041004d00200047004800320034004e005300440031000000050109000300000000010416008b12e85cec2cf040837280640e3dc85803007fff040002010c00d041030a0000000001010600020101010600000001010600000a01010600000003120a000000ffff00007fff040001043e00ef47642dc93ba041ac194d51d01b4ce631004b0048003200350031003200390030003900200039002000200020002000200020002000200000007fff04000000424f
      dp: 05 01 09 00 03 00 00 00 00 / 01 04 16 00 8b 12 e8 5c ec 2c f0 40 83 72 80 64 0e 3d c8 58 03 00 / 7f ff 04 00
    data: 00 00 47 4f 00 00 4e 4f db 00 00 00 08 00 00 00 97 00 48 00 4c 00 2d 00 44 00 54 00 2d 00 53 00 54 00 20 00 44 00 56 00 44 00 52 00 41 00 4d 00 20 00 47 00 48 00 32 00 34 00 4e 00 53 00 44 00 31 00 00 00 05 01 09 00 03 00 00 00 00 01 04 16 00 8b 12 e8 5c ec 2c f0 40 83 72 80 64 0e 3d c8 58 03 00 7f ff 04 00 02 01 0c 00 d0 41 03 0a 00 00 00 00 01 01 06 00 02 01 01 01 06 00 00 00 01 01 06 00 00 0a 01 01 06 00 00 00 03 12 0a 00 00 00 ff ff 00 00 7f ff 04 00 01 04 3e 00 ef 47 64 2d c9 3b a0 41 ac 19 4d 51 d0 1b 4c e6 31 00 4b 00 48 00 32 00 35 00 31 00 32 00 39 00 30 00 39 00 20 00 39 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 00 00 7f ff 04 00 00 00 42 4f
Boot0016* UEFI OS       HD(2,GPT,c8445ae8-33d9-43e6-a38d-bb5329f74b02,0x19800,0xfa000)/File(\EFI\BOOT\BOOTX64.EFI)0000424f
      dp: 04 01 2a 00 02 00 00 00 00 98 01 00 00 00 00 00 00 a0 0f 00 00 00 00 00 e8 5a 44 c8 d9 33 e6 43 a3 8d bb 53 29 f7 4b 02 02 02 / 04 04 30 00 5c 00 45 00 46 00 49 00 5c 00 42 00 4f 00 4f 00 54 00 5c 00 42 00 4f 00 4f 00 54 00 58 00 36 00 34 00 2e 00 45 00 46 00 49 00 00 00 / 7f ff 04 00
    data: 00 00 42 4f

Esto lo he hecho sin ejecutar el comando sudo efibootmgr -o 1,0,16,4,14, sino a través de la bios de la placa base, seleccionando las prioridades de arranque en modo UEFI (o por lo menos coincide con lo que está configurado en la BIOS).

Ahora mismo tendo las dos distros funcionando sin problemas. Veremos qué pasa en la próxima actualización del kernel.

Un saludo.

Si, te vuelve a fallar, revisa la salida de efibootmgr -v por si ha habido cambios. Y recuerda que el grub de Ubuntu no va a poder arrancar Manjaro (al revés si funciona). Es una incompatibilidad de todas las distros basadas en Arch.

De todas formas al actualizar los kernels solo se actualiza el fichero de configuración de grub /boot/grub/grub.cfg. No se cambia nada más (por ejemplo no se toca para nada la partición EFI), así que en teoría debería ser seguro. Y si algo pasa, debería ser algo que puede solucionarse corrigiendo lo que sea y ejecutando después update-grub para actualizar ese fichero.

Yo diría que la mayoría de veces que veo problemas de arranque después de actualización, es debido a algún problema con Nvidia. Que también se puede resolver de todas formas.

Pues puede ser que eso también tenga algo que ver. Esta última instalación de Manjaro la hice con los drivers libres de Nvidia mientras que las anteriores (que no funcionaron) fueron con los drivers privativos.