Can't boot my second Manjaro (after convert MBR to GPT and tweaking the BIOS/UEFI)

Hi,
yes it was kinda unnecessary and stupid tweaking my BIOS/UEFI settings to a) increase the HSI level of the firmware security and b) get rid of all legacy stuff.
jep, that’s me…

so, I have two Manjaro installations running side by side.
the main Manjaro installation continues to run flawlessly.
Here, grub is installed in UEFI according to the instructions. It is the leading grub and adds the grub entries for the second Manjaro OS via os-prober.
Grub is also installed in the second installation, but it is not written in UEFI or device, as the grub from the first installation is leading one.

Unfortunately, my second Manjaro installation no longer boots.
Also, while troubleshooting, I noticed that the SSD its on, still had MBR instead of GPT, so I converted the MBR to GPT using gdisk. I thought it might be the reason cause i disabled compatibility stuff in the BIOS/UEFI.

so far I’ve tried the following (besides unnessesary repairs of the gpt with gdisk)
Checked all uuids in /etc/fstab (still matching).
per chroot into the second one:
- mkinitcpio
- grub-mkconfig (ohne os-prober)
in the main installation:
- mkinitcpio
- grub-mkconfig (mit os-prober)
- grub-install
- copied bootx64.efi from /boot/efi/EFI/Manjaro

The error when trying to boot the second installtion:
Error: no such device: d8c3b26b-f771-48c7-a11e-fc09d6d99a3e.
Error: file ‘/boot/vmlinuz-6.16-x86_64’ not found.
Error: you need to load the kernel first.

Where is my mistake in thinking?
Is it worth trying to fix or just do a reinstall (of corse i have a backup of /home :wink: )

…and, yes, I searched the forum, but unfortunately it didn’t give me any new ideas either.

configurations:

/boot/grub/grub.cfg

#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
insmod part_gpt
insmod part_msdos
if [ -s $prefix/grubenv ]; then
  load_env
fi
if [ "${next_entry}" ] ; then
   set default="${next_entry}"
   set next_entry=
   save_env next_entry
   set boot_once=true
else
   set default="${saved_entry}"
fi

if [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
else
  menuentry_id_option=""
fi

export menuentry_id_option

if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

function load_video {
  if [ x$feature_all_video_module = xy ]; then
    insmod all_video
  else
    insmod efi_gop
    insmod efi_uga
    insmod ieee1275_fb
    insmod vbe
    insmod vga
    insmod video_bochs
    insmod video_cirrus
  fi
}

set menu_color_normal=light-gray/black
set menu_color_highlight=green/black

if [ x$feature_default_font_path = xy ] ; then
   font=unicode
else
insmod part_gpt
insmod ext2
search --no-floppy --fs-uuid --set=root a2c104c7-14bf-4d19-b775-e2095cc8d407
    font="/usr/share/grub/unicode.pf2"
fi

if loadfont $font ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
  set locale_dir=$prefix/locale
  set lang=en_US
  insmod gettext
fi
terminal_input console
terminal_output gfxterm
insmod part_gpt
insmod ext2
search --no-floppy --fs-uuid --set=root a2c104c7-14bf-4d19-b775-e2095cc8d407
insmod gfxmenu
loadfont ($root)/usr/share/grub/themes/manjaro/dejavu_sans_12.pf2
loadfont ($root)/usr/share/grub/themes/manjaro/dejavu_sans_14.pf2
loadfont ($root)/usr/share/grub/themes/manjaro/dejavu_sans_16.pf2
loadfont ($root)/usr/share/grub/themes/manjaro/dejavu_sans_24.pf2
loadfont ($root)/usr/share/grub/themes/manjaro/dejavu_sans_48.pf2
loadfont ($root)/usr/share/grub/themes/manjaro/dejavu_sans_bold_16.pf2
loadfont ($root)/usr/share/grub/themes/manjaro/dejavu_sans_mono_12.pf2
loadfont ($root)/usr/share/grub/themes/manjaro/terminus-12.pf2
loadfont ($root)/usr/share/grub/themes/manjaro/terminus-14.pf2
loadfont ($root)/usr/share/grub/themes/manjaro/terminus-16.pf2
loadfont ($root)/usr/share/grub/themes/manjaro/terminus-18.pf2
loadfont ($root)/usr/share/grub/themes/manjaro/terminus-b12.pf2
loadfont ($root)/usr/share/grub/themes/manjaro/terminus-b14.pf2
loadfont ($root)/usr/share/grub/themes/manjaro/terminus-b16.pf2
loadfont ($root)/usr/share/grub/themes/manjaro/terminus-b18.pf2
insmod png
set theme=($root)/usr/share/grub/themes/manjaro/theme.txt
export theme
if [ x$feature_timeout_style = xy ] ; then
  set timeout_style=menu
  set timeout=15
# Fallback normal timeout code in case the timeout_style feature is
# unavailable.
else
  set timeout=15
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Manjaro Linux' --class manjaro --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-a2c104c7-14bf-4d19-b775-e2095cc8d407' {
        savedefault
        load_video
        set gfxpayload=keep
        insmod gzio
        insmod part_gpt
        insmod ext2
        search --no-floppy --fs-uuid --set=root a2c104c7-14bf-4d19-b775-e2095cc8d407
        linux   /boot/vmlinuz-6.16-x86_64 root=UUID=a2c104c7-14bf-4d19-b775-e2095cc8d407 rw  sysrq_always_enabled=1 udev.log_priority=3 nmi_watchdog=0 nowatchdog acpi_enforce_resources=lax
        initrd  /boot/intel-ucode.img /boot/amd-ucode.img /boot/initramfs-6.16-x86_64.img
}
submenu 'Advanced options for Manjaro Linux' $menuentry_id_option 'gnulinux-advanced-a2c104c7-14bf-4d19-b775-e2095cc8d407' {
        menuentry 'Manjaro Linux (Kernel: 6.16.4-2-MANJARO x64)' --class manjaro --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-6.16.4-2-MANJARO x64-advanced-a2c104c7-14bf-4d19-b775-e2095cc8d407' {
        savedefault
                load_video
                set gfxpayload=keep
                insmod gzio
                insmod part_gpt
                insmod ext2
                search --no-floppy --fs-uuid --set=root a2c104c7-14bf-4d19-b775-e2095cc8d407
                linux   /boot/vmlinuz-6.16-x86_64 root=UUID=a2c104c7-14bf-4d19-b775-e2095cc8d407 rw  sysrq_always_enabled=1 udev.log_priority=3 nmi_watchdog=0 nowatchdog acpi_enforce_resources=lax
                initrd  /boot/intel-ucode.img /boot/amd-ucode.img /boot/initramfs-6.16-x86_64.img
        }
        menuentry 'Manjaro Linux (Kernel: 6.16.4-2-MANJARO x64 - fallback initramfs)' --class manjaro --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-6.16.4-2-MANJARO x64-fallback-a2c104c7-14bf-4d19-b775-e2095cc8d407' {
                load_video
                set gfxpayload=keep
                insmod gzio
                insmod part_gpt
                insmod ext2
                search --no-floppy --fs-uuid --set=root a2c104c7-14bf-4d19-b775-e2095cc8d407
                linux   /boot/vmlinuz-6.16-x86_64 root=UUID=a2c104c7-14bf-4d19-b775-e2095cc8d407 rw  sysrq_always_enabled=1 udev.log_priority=3 nmi_watchdog=0 nowatchdog acpi_enforce_resources=lax
                initrd  /boot/initramfs-6.16-x86_64-fallback.img
        }
        menuentry 'Manjaro Linux (Kernel: 6.12.44-3-MANJARO x64)' --class manjaro --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-6.12.44-3-MANJARO x64-advanced-a2c104c7-14bf-4d19-b775-e2095cc8d407' {
        savedefault
                load_video
                set gfxpayload=keep
                insmod gzio
                insmod part_gpt
                insmod ext2
                search --no-floppy --fs-uuid --set=root a2c104c7-14bf-4d19-b775-e2095cc8d407
                linux   /boot/vmlinuz-6.12-x86_64 root=UUID=a2c104c7-14bf-4d19-b775-e2095cc8d407 rw  sysrq_always_enabled=1 udev.log_priority=3 nmi_watchdog=0 nowatchdog acpi_enforce_resources=lax
                initrd  /boot/intel-ucode.img /boot/amd-ucode.img /boot/initramfs-6.12-x86_64.img
        }
        menuentry 'Manjaro Linux (Kernel: 6.12.44-3-MANJARO x64 - fallback initramfs)' --class manjaro --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-6.12.44-3-MANJARO x64-fallback-a2c104c7-14bf-4d19-b775-e2095cc8d407' {
                load_video
                set gfxpayload=keep
                insmod gzio
                insmod part_gpt
                insmod ext2
                search --no-floppy --fs-uuid --set=root a2c104c7-14bf-4d19-b775-e2095cc8d407
                linux   /boot/vmlinuz-6.12-x86_64 root=UUID=a2c104c7-14bf-4d19-b775-e2095cc8d407 rw  sysrq_always_enabled=1 udev.log_priority=3 nmi_watchdog=0 nowatchdog acpi_enforce_resources=lax
                initrd  /boot/initramfs-6.12-x86_64-fallback.img
        }
}

### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/15_ostree ###
### END /etc/grub.d/15_ostree ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/25_bli ###
if [ "$grub_platform" = "efi" ]; then
  insmod bli
fi
### END /etc/grub.d/25_bli ###

### BEGIN /etc/grub.d/30_os-prober ###
menuentry 'Manjaro Linux (25.0.9) (on /dev/sda1)' --class manjarolinux --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-simple-d8c3b26b-f771-48c7-a11e-fc09d6d99a3e' {
        savedefault
        insmod part_gpt
        insmod ext2
        set root='hd0,gpt1'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1 --hint-efi=hd0,gpt1 --hint-baremetal=ahci0,gpt1  d8c3b26b-f771-48c7-a11e-fc09d6d99a3e
        else
          search --no-floppy --fs-uuid --set=root d8c3b26b-f771-48c7-a11e-fc09d6d99a3e
        fi
        linux /boot/vmlinuz-6.16-x86_64 root=UUID=d8c3b26b-f771-48c7-a11e-fc09d6d99a3e rw quiet udev.log_priority=3 sysrq_always_enabled=1 nowatchdog acpi_enforce_resources=lax
        initrd /boot/intel-ucode.img /boot/amd-ucode.img /boot/initramfs-6.16-x86_64.img
}
submenu 'Advanced options for Manjaro Linux (25.0.9) (on /dev/sda1)' $menuentry_id_option 'osprober-gnulinux-advanced-d8c3b26b-f771-48c7-a11e-fc09d6d99a3e' {
        menuentry 'Manjaro-Xfce Linux (on /dev/sda1)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz-6.16-x86_64--d8c3b26b-f771-48c7-a11e-fc09d6d99a3e' {
                savedefault
                insmod part_gpt
                insmod ext2
                set root='hd0,gpt1'
                if [ x$feature_platform_search_hint = xy ]; then
                  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1 --hint-efi=hd0,gpt1 --hint-baremetal=ahci0,gpt1  d8c3b26b-f771-48c7-a11e-fc09d6d99a3e
                else
                  search --no-floppy --fs-uuid --set=root d8c3b26b-f771-48c7-a11e-fc09d6d99a3e
                fi
                linux /boot/vmlinuz-6.16-x86_64 root=UUID=d8c3b26b-f771-48c7-a11e-fc09d6d99a3e rw quiet udev.log_priority=3 sysrq_always_enabled=1 nowatchdog acpi_enforce_resources=lax
                initrd /boot/intel-ucode.img /boot/amd-ucode.img /boot/initramfs-6.16-x86_64.img
        }
        menuentry 'Manjaro-Xfce Linux (Kernel 6.16.4-1-MANJARO x64) (on /dev/sda1)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz-6.16-x86_64--d8c3b26b-f771-48c7-a11e-fc09d6d99a3e' {
                savedefault
                insmod part_gpt
                insmod ext2
                set root='hd0,gpt1'
                if [ x$feature_platform_search_hint = xy ]; then
                  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1 --hint-efi=hd0,gpt1 --hint-baremetal=ahci0,gpt1  d8c3b26b-f771-48c7-a11e-fc09d6d99a3e
                else
                  search --no-floppy --fs-uuid --set=root d8c3b26b-f771-48c7-a11e-fc09d6d99a3e
                fi
                linux /boot/vmlinuz-6.16-x86_64 root=UUID=d8c3b26b-f771-48c7-a11e-fc09d6d99a3e rw quiet udev.log_priority=3 sysrq_always_enabled=1 nowatchdog acpi_enforce_resources=lax
                initrd /boot/intel-ucode.img /boot/amd-ucode.img /boot/initramfs-6.16-x86_64.img
        }
        menuentry 'Manjaro-Xfce Linux (Kernel 6.16.4-1-MANJARO x64 - fallback initramfs) (on /dev/sda1)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz-6.16-x86_64--d8c3b26b-f771-48c7-a11e-fc09d6d99a3e' {
                savedefault
                insmod part_gpt
                insmod ext2
                set root='hd0,gpt1'
                if [ x$feature_platform_search_hint = xy ]; then
                  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1 --hint-efi=hd0,gpt1 --hint-baremetal=ahci0,gpt1  d8c3b26b-f771-48c7-a11e-fc09d6d99a3e
                else
                  search --no-floppy --fs-uuid --set=root d8c3b26b-f771-48c7-a11e-fc09d6d99a3e
                fi
                linux /boot/vmlinuz-6.16-x86_64 root=UUID=d8c3b26b-f771-48c7-a11e-fc09d6d99a3e rw quiet udev.log_priority=3 sysrq_always_enabled=1 nowatchdog acpi_enforce_resources=lax
                initrd /boot/initramfs-6.16-x86_64-fallback.img
        }
        menuentry 'Manjaro-Xfce Linux (Kernel 6.12.44-3-MANJARO x64) (on /dev/sda1)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz-6.12-x86_64--d8c3b26b-f771-48c7-a11e-fc09d6d99a3e' {
                savedefault
                insmod part_gpt
                insmod ext2
                set root='hd0,gpt1'
                if [ x$feature_platform_search_hint = xy ]; then
                  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1 --hint-efi=hd0,gpt1 --hint-baremetal=ahci0,gpt1  d8c3b26b-f771-48c7-a11e-fc09d6d99a3e
                else
                  search --no-floppy --fs-uuid --set=root d8c3b26b-f771-48c7-a11e-fc09d6d99a3e
                fi
                linux /boot/vmlinuz-6.12-x86_64 root=UUID=d8c3b26b-f771-48c7-a11e-fc09d6d99a3e rw quiet udev.log_priority=3 sysrq_always_enabled=1 nowatchdog acpi_enforce_resources=lax
                initrd /boot/intel-ucode.img /boot/amd-ucode.img /boot/initramfs-6.12-x86_64.img
        }
        menuentry 'Manjaro-Xfce Linux (Kernel 6.12.44-3-MANJARO x64 - fallback initramfs) (on /dev/sda1)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz-6.12-x86_64--d8c3b26b-f771-48c7-a11e-fc09d6d99a3e' {
                savedefault
                insmod part_gpt
                insmod ext2
                set root='hd0,gpt1'
                if [ x$feature_platform_search_hint = xy ]; then
                  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1 --hint-efi=hd0,gpt1 --hint-baremetal=ahci0,gpt1  d8c3b26b-f771-48c7-a11e-fc09d6d99a3e
                else
                  search --no-floppy --fs-uuid --set=root d8c3b26b-f771-48c7-a11e-fc09d6d99a3e
                fi
                linux /boot/vmlinuz-6.12-x86_64 root=UUID=d8c3b26b-f771-48c7-a11e-fc09d6d99a3e rw quiet udev.log_priority=3 sysrq_always_enabled=1 nowatchdog acpi_enforce_resources=lax
                initrd /boot/initramfs-6.12-x86_64-fallback.img
        }
        menuentry 'Memory Tester (memtest86+) (on /dev/sda1)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/memtest86+/memtest.bin--d8c3b26b-f771-48c7-a11e-fc09d6d99a3e' {
                savedefault
                insmod part_gpt
                insmod ext2
                set root='hd0,gpt1'
                if [ x$feature_platform_search_hint = xy ]; then
                  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1 --hint-efi=hd0,gpt1 --hint-baremetal=ahci0,gpt1  d8c3b26b-f771-48c7-a11e-fc09d6d99a3e
                else
                  search --no-floppy --fs-uuid --set=root d8c3b26b-f771-48c7-a11e-fc09d6d99a3e
                fi
                linux /boot/memtest86+/memtest.bin 
        }
        menuentry 'Memory Tester (memtest86+) (on /dev/sda1)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/memtest86+/memtest.efi--d8c3b26b-f771-48c7-a11e-fc09d6d99a3e' {
                savedefault
                insmod part_gpt
                insmod ext2
                set root='hd0,gpt1'
                if [ x$feature_platform_search_hint = xy ]; then
                  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1 --hint-efi=hd0,gpt1 --hint-baremetal=ahci0,gpt1  d8c3b26b-f771-48c7-a11e-fc09d6d99a3e
                else
                  search --no-floppy --fs-uuid --set=root d8c3b26b-f771-48c7-a11e-fc09d6d99a3e
                fi
                linux /boot/memtest86+/memtest.efi 
        }
}

set timeout_style=menu
if [ "${timeout}" = 0 ]; then
  set timeout=10
fi
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/30_uefi-firmware ###
if [ "$grub_platform" = "efi" ]; then
        menuentry 'UEFI Firmware Settings' $menuentry_id_option 'uefi-firmware' {
                fwsetup
                }
fi
### END /etc/grub.d/30_uefi-firmware ###

### BEGIN /etc/grub.d/35_fwupd ###
### END /etc/grub.d/35_fwupd ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  ${config_directory}/custom.cfg ]; then
  source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg
fi
### END /etc/grub.d/41_custom ###

### BEGIN /etc/grub.d/41_snapshots-btrfs ###
### END /etc/grub.d/41_snapshots-btrfs ###

### BEGIN /etc/grub.d/60_memtest86+ ###
if [ "${grub_platform}" == "pc" ]; then
    menuentry "Memory Tester (memtest86+)" --class memtest86 --class gnu --class tool {
        search --fs-uuid --no-floppy --set=root  a2c104c7-14bf-4d19-b775-e2095cc8d407
        linux16 /boot/memtest86+/memtest.bin 
    }
fi
### END /etc/grub.d/60_memtest86+ ###

### BEGIN /etc/grub.d/60_memtest86+-efi ###
if [ "${grub_platform}" == "efi" ]; then
    menuentry "Memory Tester (memtest86+)" --class memtest86 --class gnu --class tool {
        if loadfont unicode ; then
            set gfxmode=1024x768,800x600,auto
            set gfxpayload=800x600,1024x768
            terminal_output gfxterm
        fi
        search --fs-uuid --no-floppy --set=root  a2c104c7-14bf-4d19-b775-e2095cc8d407
        linux /boot/memtest86+/memtest.efi 
    }
fi
### END /etc/grub.d/60_memtest86+-efi ###

fstab:

# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a device; this may
# be used with UUID= as a more robust way to name devices that works even if
# disks are added and removed. See fstab(5).
#
# <file system>             <mount point>  <type>  <options>  <dump>  <pass>
UUID=d8c3b26b-f771-48c7-a11e-fc09d6d99a3e /              ext4    defaults,noatime 0 1
/swapfile  none swap defaults 0 0

blkid

manjaro-chroot /mnt blkid                                                                                                                                                                                                                                                   ✔
/dev/nvme0n1p3: LABEL="swap" UUID="d95afaf3-44fe-47d6-9938-66d0dee66ea5" TYPE="swap" PARTUUID="9a542eab-1951-41a7-a9ef-9402d1221028"
/dev/nvme0n1p1: UUID="5C2E-2A1A" BLOCK_SIZE="512" TYPE="vfat" PARTUUID="c08f7468-595d-473b-9da8-9892dd69a0d9"
/dev/nvme0n1p2: UUID="a2c104c7-14bf-4d19-b775-e2095cc8d407" BLOCK_SIZE="4096" TYPE="ext4" PARTLABEL="root" PARTUUID="bc308386-9c86-4e06-9f9d-5e9faa8ecc7b"
/dev/sdb2: LABEL="BackupII" UUID="e0967a4a-9a0d-4483-a7fa-10fc96595cb7" BLOCK_SIZE="4096" TYPE="ext4" PARTUUID="97b239c0-02"
/dev/sdb1: LABEL="Daten3" BLOCK_SIZE="512" UUID="86E470A6E47099DF" TYPE="ntfs" PARTUUID="97b239c0-01"
/dev/sda2: LABEL="Timeshift" UUID="ed8facc8-ca20-417c-8a2e-49692c97eeec" BLOCK_SIZE="4096" TYPE="ext4" PARTLABEL="Linux filesystem" PARTUUID="ed8facc8-ca20-417c-8a2e-49692c97eeec"
/dev/sda3: UUID="89ae3272-31e1-45b7-ab66-679fce063e8b" TYPE="swap" PARTLABEL="Linux swap" PARTUUID="89ae3272-31e1-45b7-ab66-679fce063e8b"
/dev/sda1: LABEL="xfce" UUID="d8c3b26b-f771-48c7-a11e-fc09d6d99a3e" BLOCK_SIZE="4096" TYPE="ext4" PARTLABEL="Linux filesystem" PARTUUID="d8c3b26b-f771-48c7-a11e-fc09d6d99a3e"

lsblk

manjaro-chroot /mnt lsblk -f                                                                                                                                                                                                                                                ✔
NAME        FSTYPE FSVER LABEL UUID FSAVAIL FSUSE% MOUNTPOINTS
sda
|-sda1                                57,2G    75% /
|-sda2
`-sda3
sdb
|-sdb1
`-sdb2
nvme0n1
|-nvme0n1p1
|-nvme0n1p2                          150,8G    77% /etc/resolv.conf
`-nvme0n1p3                                        [SWAP]

I find it strange that lsblk doesn’t display a uuid in the chroot.
However, it does display one in the first installation:

sudo lsblk -f                                                                                                                                                                                                                                                           INT ✘
NAME        FSTYPE FSVER LABEL     UUID                                 FSAVAIL FSUSE% MOUNTPOINTS
sda
├─sda1      ext4   1.0   xfce      d8c3b26b-f771-48c7-a11e-fc09d6d99a3e   57,2G    75% /mnt
├─sda2      ext4   1.0   Timeshift ed8facc8-ca20-417c-8a2e-49692c97eeec
└─sda3      swap   1               89ae3272-31e1-45b7-ab66-679fce063e8b
sdb
├─sdb1      ntfs         Daten3    86E470A6E47099DF
└─sdb2      ext4   1.0   BackupII  e0967a4a-9a0d-4483-a7fa-10fc96595cb7
nvme0n1
├─nvme0n1p1 vfat   FAT32           5C2E-2A1A                             299,1M     0% /boot/efi
├─nvme0n1p2 ext4   1.0             a2c104c7-14bf-4d19-b775-e2095cc8d407  150,8G    77% /
└─nvme0n1p3 swap   1     swap      d95afaf3-44fe-47d6-9938-66d0dee66ea5                [SWAP]

inxi (first installation)

sudo inxi -zv8m                                                                                                                                                                                                                                                         INT ✘
[sudo] password for alexander:
System:
  Kernel: 6.16.4-2-MANJARO arch: x86_64 bits: 64 compiler: gcc v: 15.2.1
    clocksource: tsc avail: hpet,acpi_pm
    parameters: BOOT_IMAGE=/boot/vmlinuz-6.16-x86_64
    root=UUID=a2c104c7-14bf-4d19-b775-e2095cc8d407 rw sysrq_always_enabled=1
    udev.log_priority=3 nmi_watchdog=0 nowatchdog acpi_enforce_resources=lax
  Desktop: KDE Plasma v: 6.4.4 tk: Qt v: N/A wm: kwin_wayland dm: SDDM
    Distro: Manjaro base: Arch Linux
Machine:
  Type: Desktop System: ASUS product: N/A v: N/A serial: N/A
  Mobo: ASUSTeK model: ROG STRIX B650E-F GAMING WIFI v: Rev 1.xx
    serial: <filter> part-nu: SKU uuid: 2500e437-a72d-7062-a7d6-60cf8477243b
    UEFI: American Megatrends v: 3279 date: 07/21/2025
Battery:
  Device-1: sony_controller_battery_00:1e:3d:5c:58:af model: N/A serial: N/A
    charge: N/A status: N/A
Memory:
  System RAM: total: 64 GiB available: 62.45 GiB used: 4.96 GiB (7.9%)
  Array-1: capacity: 256 GiB slots: 4 modules: 2 EC: None
    max-module-size: 64 GiB note: est.
  Device-1: Channel-A DIMM 0 type: no module installed
  Device-2: Channel-A DIMM 1 type: DDR5 detail: synchronous unbuffered
    (unregistered) size: 32 GiB speed: spec: 4800 MT/s actual: 5600 MT/s
    volts: curr: 1.1 min: 1.1 max: 1.1 width (bits): data: 64 total: 64
    manufacturer: Corsair part-no: CMK64GX5M2B5600Z40 serial: N/A
  Device-3: Channel-B DIMM 0 type: no module installed
  Device-4: Channel-B DIMM 1 type: DDR5 detail: synchronous unbuffered
    (unregistered) size: 32 GiB speed: spec: 4800 MT/s actual: 5600 MT/s
    volts: curr: 1.1 min: 1.1 max: 1.1 width (bits): data: 64 total: 64
    manufacturer: Corsair part-no: CMK64GX5M2B5600Z40 serial: N/A
PCI Slots:
  Slot: 0 type: PCIe gen: 5 status: in use length: long volts: 3.3
    bus-ID: 00:01.1 children: 1: 01:00.0 class-ID: 0604 type: bridge children:
    1: 02:00.0 class-ID: 0604 type: bridge children: 1: 03:00.0 class-ID: 0300
    type: display 2: 03:00.1 class-ID: 0403 type: audio
  Slot: 1 type: PCIe gen: 4 status: available length: short volts: 3.3
    bus-ID: 00:1f.7
  Slot: 2 type: PCIe gen: 4 status: available length: short volts: 3.3
    bus-ID: 00:1f.7
  Slot: 3 type: PCIe gen: 4 status: available length: long volts: 3.3
    bus-ID: 00:1f.7
  Slot: N/A type: N/A status: available info: M.2 length: long volts: 3.3
    bus-ID: 00:1f.7
  Slot: N/A type: N/A status: in use info: M.2 length: long volts: 3.3
    bus-ID: 00:02.2 children: 1: 0d:00.0 class-ID: 0108 type: mass-storage
  Slot: N/A type: N/A status: available info: M.2 length: long volts: 3.3
    bus-ID: 00:1f.7
  Slot: N/A type: N/A status: in use info: M.2 length: short volts: 3.3
    bus-ID: 05:0b.0
CPU:
  Info: model: AMD Ryzen 9 9900X3D socket: AM5 bits: 64 type: MT MCP
    arch: Zen 5 gen: 5 level: v4 note: check built: 2024+ process: TSMC n4 (4nm)
    family: 0x1A (26) model-id: 0x44 (68) stepping: 0 microcode: 0xB404032
  Topology: cpus: 1x dies: 2 clusters: 2x1 cores: 12 threads: 24 tpc: 2
    smt: enabled cache: L1: 960 KiB desc: d-12x48 KiB; i-12x32 KiB L2: 12 MiB
    desc: 12x1024 KiB L3: 128 MiB desc: 1x32 MiB, 1x96 MiB
  Speed (MHz): avg: 605 min/max: 605/5576 boost: enabled
    base/boost: 4400/5550 scaling: driver: amd-pstate-epp governor: powersave
    volts: 1.3 V ext-clock: 100 MHz cores: 1: 605 2: 605 3: 605 4: 605 5: 605
    6: 605 7: 605 8: 605 9: 605 10: 605 11: 605 12: 605 13: 605 14: 605
    15: 605 16: 605 17: 605 18: 605 19: 605 20: 605 21: 605 22: 605 23: 605
    24: 605 bogomips: 211199
  Flags: 3dnowprefetch abm adx aes amd_lbr_pmc_freeze amd_lbr_v2 aperfmperf
    apic arat avic avx avx2 avx512_bf16 avx512_bitalg avx512_vbmi2
    avx512_vnni avx512_vp2intersect avx512_vpopcntdq avx512bw avx512cd
    avx512dq avx512f avx512ifma avx512vbmi avx512vl avx_vnni bmi1 bmi2 bpext
    bus_lock_detect cat_l3 cdp_l3 clflush clflushopt clwb clzero cmov
    cmp_legacy constant_tsc cpb cppc cpuid cqm cqm_llc cqm_mbm_local
    cqm_mbm_total cqm_occup_llc cr8_legacy cx16 cx8 de decodeassists erms
    extapic extd_apicid f16c flush_l1d flushbyasid fma fpu fsgsbase fsrm fxsr
    fxsr_opt gfni ht hw_pstate ibpb ibrs ibrs_enhanced ibs invpcid irperf
    lahf_lm lbrv lm mba mca mce misalignsse mmx mmxext monitor movbe
    movdir64b movdiri msr mtrr mwaitx nonstop_tsc nopl npt nrip_save nx ospke
    osvw overflow_recov pae pat pausefilter pclmulqdq pdpe1gb perfctr_core
    perfctr_llc perfctr_nb perfmon_v2 pfthreshold pge pku pni popcnt pse
    pse36 rapl rdpid rdpru rdrand rdseed rdt_a rdtscp rep_good sep sha_ni
    skinit smap smca smep ssbd sse sse2 sse4_1 sse4_2 sse4a ssse3 stibp
    succor svm svm_lock syscall tce topoext tsc tsc_adjust tsc_scale umip
    user_shstk v_spec_ctrl v_vmsave_vmload vaes vgif vmcb_clean vme vmmcall
    vnmi vpclmulqdq wbnoinvd wdt x2avic xgetbv1 xsave xsavec xsaveerptr
    xsaveopt xsaves xtopology
  Vulnerabilities:
  Type: gather_data_sampling status: Not affected
  Type: ghostwrite status: Not affected
  Type: indirect_target_selection status: Not affected
  Type: itlb_multihit status: Not affected
  Type: l1tf status: Not affected
  Type: mds status: Not affected
  Type: meltdown status: Not affected
  Type: mmio_stale_data status: Not affected
  Type: old_microcode status: Not affected
  Type: reg_file_data_sampling status: Not affected
  Type: retbleed status: Not affected
  Type: spec_rstack_overflow mitigation: IBPB on VMEXIT only
  Type: spec_store_bypass mitigation: Speculative Store Bypass disabled via
    prctl
  Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer
    sanitization
  Type: spectre_v2 mitigation: Enhanced / Automatic IBRS; IBPB:
    conditional; STIBP: always-on; PBRSB-eIBRS: Not affected; BHI: Not
    affected
  Type: srbds status: Not affected
  Type: tsa status: Not affected
  Type: tsx_async_abort status: Not affected
Graphics:
  Device-1: Advanced Micro Devices [AMD/ATI] Navi 48 [Radeon RX 9070/9070
    XT/9070 GRE] vendor: Tul / PowerColor Reaper driver: amdgpu v: kernel
    arch: RDNA-4 code: Navi-4x process: TSMC n4 (4nm) built: 2025+ pcie:
    gen: 5 speed: 32 GT/s lanes: 16 ports: active: DP-1 empty: DP-2, DP-3,
    HDMI-A-1, Writeback-1 bus-ID: 03:00.0 chip-ID: 1002:7550 class-ID: 0300
  Display: unspecified server: X.Org v: 24.1.8 with: Xwayland v: 24.1.8
    compositor: kwin_wayland driver: X: loaded: amdgpu
    unloaded: modesetting,radeon alternate: fbdev,vesa dri: radeonsi
    gpu: amdgpu display-ID: :0 screens: 1
  Screen-1: 0 s-res: 2560x1440 s-dpi: 96 s-size: 677x381mm (26.65x15.00")
    s-diag: 777mm (30.58")
  Monitor-1: DP-1 model: LG (GoldStar) ULTRAGEAR serial: <filter>
    built: 2024 res: mode: 2560x1440 hz: 60 scale: 100% (1) dpi: 93 gamma: 1.2
    chroma: red: x: 0.686 y: 0.310 green: x: 0.263 y: 0.671 blue: x: 0.149
    y: 0.055 white: x: 0.314 y: 0.329 size: 697x392mm (27.44x15.43")
    diag: 800mm (31.5") ratio: 16:9 modes: 2560x1440, 1920x1200, 1920x1080,
    1600x1200, 1680x1050, 1280x1024, 1440x900, 1280x800, 1280x720, 1024x768,
    800x600, 720x480, 640x480
  EDID-Warnings: 1: parse_edid: unknown tag 112
  API: EGL v: 1.5 hw: drv: amd radeonsi platforms: device: 0 drv: radeonsi
    device: 1 drv: swrast gbm: drv: radeonsi surfaceless: drv: radeonsi x11:
    drv: radeonsi inactive: wayland
  API: OpenGL v: 4.6 compat-v: 4.5 vendor: amd mesa v: 25.2.1-arch1.5
    glx-v: 1.4 direct-render: yes renderer: AMD Radeon RX 9070 XT (radeonsi
    gfx1201 LLVM 20.1.8 DRM 3.64 6.16.4-2-MANJARO) device-ID: 1002:7550
    memory: 15.62 GiB unified: no
  API: Vulkan v: 1.4.321 layers: 5 device: 0 type: discrete-gpu
    name: AMD Radeon RX 9070 XT driver: amd v: 2025.Q2.1 (LLPC)
    device-ID: 1002:7550 surfaces: N/A
  Info: Tools: api: clinfo, eglinfo, glxinfo, vulkaninfo
    de: kscreen-console,kscreen-doctor gpu: lact wl: wayland-info
    x11: xdpyinfo, xprop, xrandr
Audio:
  Device-1: Advanced Micro Devices [AMD/ATI] Navi 48 HDMI/DP Audio
    driver: snd_hda_intel v: kernel pcie: gen: 5 speed: 32 GT/s lanes: 16
    bus-ID: 03:00.1 chip-ID: 1002:ab40 class-ID: 0403
  Device-2: ASUSTek USB Audio driver: hid-generic,snd-usb-audio,usbhid
    type: USB rev: 2.0 speed: 480 Mb/s lanes: 1 mode: 2.0 bus-ID: 1-6:3
    chip-ID: 0b05:1a52 class-ID: 0300
  API: ALSA v: k6.16.4-2-MANJARO status: kernel-api with: aoss
    type: oss-emulator tools: alsactl,alsamixer,amixer
  Server-1: PipeWire v: 1.4.7 status: n/a (root, process) with:
    1: pipewire-pulse status: active 2: wireplumber status: active
    3: pipewire-alsa type: plugin 4: pw-jack type: plugin
    tools: pactl,pw-cat,pw-cli,wpctl
Network:
  Device-1: Intel Ethernet I226-V vendor: ASUSTeK driver: igc v: kernel pcie:
    gen: 2 speed: 5 GT/s lanes: 1 port: N/A bus-ID: 09:00.0 chip-ID: 8086:125c
    class-ID: 0200
  IF: eno1 state: up speed: 100 Mbps duplex: full mac: <filter>
  IP v4: <filter> type: dynamic noprefixroute scope: global
    broadcast: <filter>
  Device-2: MEDIATEK MT7922 802.11ax PCI Express Wireless Network Adapter
    vendor: Foxconn driver: mt7921e v: kernel pcie: gen: 2 speed: 5 GT/s
    lanes: 1 bus-ID: 0a:00.0 chip-ID: 14c3:0616 class-ID: 0280
  IF: wlp10s0 state: up mac: <filter>
  IP v4: <filter> type: dynamic noprefixroute scope: global
    broadcast: <filter>
  IF-ID-1: virbr0 state: down mac: <filter>
  IP v4: <filter> scope: global broadcast: <filter>
  Info: services: NetworkManager, systemd-timesyncd, wpa_supplicant
  WAN IP: <filter>
Bluetooth:
  Device-1: Foxconn / Hon Hai Wireless_Device driver: btusb v: 0.8 type: USB
    rev: 2.1 speed: 480 Mb/s lanes: 1 mode: 2.0 bus-ID: 1-11:8
    chip-ID: 0489:e0e2 class-ID: e001 serial: <filter>
  Report: hciconfig ID: hci0 rfk-id: 0 state: up address: <filter> bt-v: 5.2
    lmp-v: 11 sub-v: 2505 hci-v: 11 rev: 2310 class-ID: 6c0104
  Info: acl-mtu: 1021:6 sco-mtu: 240:8 link-policy: rswitch sniff
    link-mode: peripheral accept service-classes: rendering, capturing, audio,
    telephony
Logical:
  Message: No logical block device data found.
RAID:
  Message: No RAID data found.
Drives:
  Local Storage: total: 3.18 TiB used: 871.43 GiB (26.7%)
  ID-1: /dev/nvme0n1 maj-min: 259:0 vendor: Crucial model: CT1000T500SSD8
    size: 931.51 GiB block-size: physical: 512 B logical: 512 B speed: 63.2 Gb/s
    lanes: 4 tech: SSD serial: <filter> fw-rev: P8CR003 temp: 32.9 C
    scheme: GPT
  SMART: yes health: PASSED on: 109d 7h cycles: 253
    read-units: 19,791,747 [10.1 TB] written-units: 18,444,711 [9.44 TB]
  ID-2: /dev/sda maj-min: 8:0 vendor: Samsung model: SSD 870 EVO 500GB
    family: based SSDs size: 465.76 GiB block-size: physical: 512 B
    logical: 512 B sata: 3.3 speed: 6.0 Gb/s tech: SSD serial: <filter>
    fw-rev: 2B6Q temp: 29 C scheme: GPT
  SMART: yes state: enabled health: PASSED on: 332d 1h cycles: 1256
    written: 7.77 TiB
  ID-3: /dev/sdb maj-min: 8:16 vendor: Hitachi model: HDS5C3020ALA632
    family: Deskstar 5K3000 size: 1.82 TiB block-size: physical: 512 B
    logical: 512 B sata: 2.6 speed: 6.0 Gb/s tech: HDD rpm: 5940
    serial: <filter> fw-rev: A580 temp: 33 C scheme: MBR
  SMART: yes state: enabled health: PASSED on: 4y 181d 0h cycles: 7652
  Message: No optical or floppy data found.
Partition:
  ID-1: / raw-size: 864.68 GiB size: 850.03 GiB (98.31%)
    used: 655.97 GiB (77.2%) fs: ext4 block-size: 4096 B dev: /dev/nvme0n1p2
    maj-min: 259:2 label: N/A uuid: a2c104c7-14bf-4d19-b775-e2095cc8d407
  ID-2: /boot/efi raw-size: 300 MiB size: 299.4 MiB (99.80%)
    used: 320 KiB (0.1%) fs: vfat block-size: 512 B dev: /dev/nvme0n1p1
    maj-min: 259:1 label: N/A uuid: 5C2E-2A1A
  ID-3: /mnt raw-size: 292.97 GiB size: 287.31 GiB (98.07%)
    used: 215.46 GiB (75.0%) fs: ext4 block-size: 4096 B dev: /dev/sda1
    maj-min: 8:1 label: xfce uuid: d8c3b26b-f771-48c7-a11e-fc09d6d99a3e
Swap:
  Kernel: swappiness: 60 (default) cache-pressure: 100 (default) zswap: yes
    compressor: zstd max-pool: 20%
  ID-1: swap-1 type: partition size: 66.54 GiB used: 6.6 MiB (0.0%)
    priority: -2 dev: /dev/nvme0n1p3 maj-min: 259:3 label: swap
    uuid: d95afaf3-44fe-47d6-9938-66d0dee66ea5
Unmounted:
  ID-1: /dev/sda2 maj-min: 8:2 size: 161.79 GiB fs: ext4 label: Timeshift
    uuid: ed8facc8-ca20-417c-8a2e-49692c97eeec
  ID-2: /dev/sda3 maj-min: 8:3 size: 11 GiB fs: swap label: N/A
    uuid: 89ae3272-31e1-45b7-ab66-679fce063e8b
  ID-3: /dev/sdb1 maj-min: 8:17 size: 1.15 TiB fs: ntfs label: Daten3
    uuid: 86E470A6E47099DF
  ID-4: /dev/sdb2 maj-min: 8:18 size: 686.12 GiB fs: ext4 label: BackupII
    uuid: e0967a4a-9a0d-4483-a7fa-10fc96595cb7
USB:
  Hub-1: 1-0:1 info: hi-speed hub with single TT ports: 12 rev: 2.0
    speed: 480 Mb/s (57.2 MiB/s) lanes: 1 mode: 2.0 chip-ID: 1d6b:0002
    class-ID: 0900
  Device-1: 1-2:2 info: Sony Batoh Device / PlayStation 3 Controller
    type: HID driver: sony,usbhid interfaces: 1 rev: 2.0
    speed: 12 Mb/s (1.4 MiB/s) lanes: 1 mode: 1.1 power: 500mA
    chip-ID: 054c:0268 class-ID: 0300
  Device-2: 1-6:3 info: ASUSTek USB Audio type: audio,HID
    driver: hid-generic,snd-usb-audio,usbhid interfaces: 8 rev: 2.0
    speed: 480 Mb/s (57.2 MiB/s) lanes: 1 mode: 2.0 power: 100mA
    chip-ID: 0b05:1a52 class-ID: 0300
  Device-3: 1-7:4 info: ASUSTek AURA LED Controller type: HID
    driver: hid-generic,usbhid interfaces: 2 rev: 2.0 speed: 12 Mb/s (1.4 MiB/s)
    lanes: 1 mode: 1.1 power: 16mA chip-ID: 0b05:19af class-ID: 0300
    serial: <filter>
  Hub-2: 1-8:5 info: Genesys Logic Hub ports: 4 rev: 2.0
    speed: 480 Mb/s (57.2 MiB/s) lanes: 1 mode: 2.0 power: 100mA
    chip-ID: 05e3:0608 class-ID: 0900
  Device-1: 1-9:6 info: Razer USA Basilisk V3 type: mouse,keyboard,HID
    driver: hid-generic,usbhid interfaces: 4 rev: 2.0 speed: 12 Mb/s (1.4 MiB/s)
    lanes: 1 mode: 1.1 power: 500mA chip-ID: 1532:0099 class-ID: 0300
  Device-2: 1-10:7 info: SteelSeries ApS Apex Pro Gen 3 type: keyboard,HID
    driver: hid-generic,usbhid interfaces: 5 rev: 2.0 speed: 12 Mb/s (1.4 MiB/s)
    lanes: 1 mode: 1.1 power: 500mA chip-ID: 1038:1640 class-ID: 0300
  Device-3: 1-11:8 info: Foxconn / Hon Hai Wireless_Device type: bluetooth
    driver: btusb interfaces: 3 rev: 2.1 speed: 480 Mb/s (57.2 MiB/s) lanes: 1
    mode: 2.0 power: 100mA chip-ID: 0489:e0e2 class-ID: e001 serial: <filter>
  Hub-3: 2-0:1 info: super-speed hub ports: 5 rev: 3.1
    speed: 20 Gb/s (2.33 GiB/s) lanes: 2 mode: 3.2 gen-2x2 chip-ID: 1d6b:0003
    class-ID: 0900
  Hub-4: 3-0:1 info: hi-speed hub with single TT ports: 2 rev: 2.0
    speed: 480 Mb/s (57.2 MiB/s) lanes: 1 mode: 2.0 chip-ID: 1d6b:0002
    class-ID: 0900
  Hub-5: 4-0:1 info: super-speed hub ports: 2 rev: 3.1
    speed: 10 Gb/s (1.16 GiB/s) lanes: 1 mode: 3.2 gen-2x1 chip-ID: 1d6b:0003
    class-ID: 0900
  Hub-6: 5-0:1 info: hi-speed hub with single TT ports: 2 rev: 2.0
    speed: 480 Mb/s (57.2 MiB/s) lanes: 1 mode: 2.0 chip-ID: 1d6b:0002
    class-ID: 0900
  Hub-7: 5-2:2 info: ASMedia ASM1074 High-Speed hub ports: 4 rev: 2.1
    speed: 480 Mb/s (57.2 MiB/s) lanes: 1 mode: 2.0 power: 100mA
    chip-ID: 174c:2074 class-ID: 0900
  Hub-8: 6-0:1 info: super-speed hub ports: 2 rev: 3.1
    speed: 10 Gb/s (1.16 GiB/s) lanes: 1 mode: 3.2 gen-2x1 chip-ID: 1d6b:0003
    class-ID: 0900
  Hub-9: 6-2:2 info: ASMedia ASM1074 SuperSpeed hub ports: 4 rev: 3.0
    speed: 5 Gb/s (596.0 MiB/s) lanes: 1 mode: 3.2 gen-1x1 power: 8mA
    chip-ID: 174c:3074 class-ID: 0900
  Hub-10: 7-0:1 info: hi-speed hub with single TT ports: 1 rev: 2.0
    speed: 480 Mb/s (57.2 MiB/s) lanes: 1 mode: 2.0 chip-ID: 1d6b:0002
    class-ID: 0900
  Hub-11: 8-0:1 info: Linux Foundation 3.0 root hub ports: N/A rev: 3.0
    speed: 5 Gb/s (596.0 MiB/s) lanes: 1 mode: 3.2 gen-1x1 chip-ID: 1d6b:0003
    class-ID: 0900
Sensors:
  System Temperatures: cpu: 34.0 C mobo: 29.0 C gpu: amdgpu temp: 40.0 C
    mem: 59.0 C
  Fan Speeds (rpm): fan-1: 0 fan-2: 672 fan-3: 0 fan-4: 0 fan-5: 0 fan-6: 0
    fan-7: 0 gpu: amdgpu fan: 0
Repos:
  Packages: 1860 pm: pacman pkgs: 1849 libs: 468 tools: pamac pm: flatpak
    pkgs: 11
  Active pacman repo servers in: /etc/pacman.d/mirrorlist
    1: https://ftp.gwdg.de/pub/linux/manjaro/unstable/$repo/$arch
    2: https://mirror.alpix.eu/manjaro/unstable/$repo/$arch
Processes:
  CPU top: 5 of 414
  1: cpu: 1.7% command: clamd pid: 774 mem: 1378.6 MiB (2.1%)
  2: cpu: 1.3% command: firefox pid: 2714 mem: 559.6 MiB (0.8%)
  3: cpu: 0.7% command: kwin_wayland pid: 1253 mem: 405.9 MiB (0.6%)
  4: cpu: 0.6% command: firefox pid: 3897 mem: 311.1 MiB (0.4%)
  5: cpu: 0.5% command: kwrite pid: 4853 mem: 273.4 MiB (0.4%)
  Memory top: 5 of 414
  1: mem: 1378.6 MiB (2.1%) command: clamd pid: 774 cpu: 1.7%
  2: mem: 559.6 MiB (0.8%) command: firefox pid: 2714 cpu: 1.3%
  3: mem: 405.9 MiB (0.6%) command: kwin_wayland pid: 1253 cpu: 0.7%
  4: mem: 380.7 MiB (0.5%) command: plasmashell pid: 1486 cpu: 0.4%
  5: mem: 328.8 MiB (0.5%) command: baloo_file pid: 1251 cpu: 0.1%
Info:
  Processes: 414 Power: uptime: 47m states: freeze,mem,disk suspend: deep
    avail: s2idle wakeups: 0 hibernate: platform avail: shutdown, reboot,
    suspend, test_resume image: 24.96 GiB services: org_kde_powerdevil,
    power-profiles-daemon, upowerd Init: systemd v: 257 default: graphical
    tool: systemctl
  Compilers: clang: 20.1.8 gcc: 15.2.1 Shell: Sudo (sudo) v: 1.9.17p1
    default: Bash v: 5.3.3 running-in: yakuake inxi: 3.3.39

I expect changing MBR to GPT altered some uuid’s check fstab there may be changes you need to make.

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And also check grub.cfg

:footprints:

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this is not so simple :
you have only one /boot/efi ( may be boot micro$oft also present )
you have 2 partitions on each disk for /

first update missing UUID / partittion
do sudo lsblk -fs before chroot

you cant install 2 manjaro on 2 disks with only one /boot/efi , trouble come also
with --bootloader-id=manjaro ( grub-install ) because it is the same name entry efibootmgr , so only one can be present by this command

if you change the name you will have 2 entries in UEFI ( this is not a feature )

grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=manjaro --recheck --verbose
efibootmgr -v

you will have to redo this for any bootloader name that differs from manjaro

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It looks like you should adjust your UUID in /etc/fstab so that it matches that of your designated swap partition on sda3.

Or, check /etc/default/grub to see that the resume=UUID= matches appropriately.

Good luck, anyway, as it’s way past sleeptime in this neck of the woods. Goodnight.

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Hurray, I finally managed to boot the second Manjaro installation again!

After double-checking the UUIDs in fstab and grub.cfg
(thanks @soundofthunder for pointing out the swap. It was a legacy issue from transferring the installation from my old PC)
and seeing no improvement, @stephane’s post finally provided the solution.

It took me a while to figure out that I had to use manjaro-chroot -a instead of manjaro-chroot /mnt , but after that, it worked without any problems.

You actually need a separate entry in UEFI for each installation. I still don’t quite understand why it no longer works via a shared Grub.

The only thing that bothers me now is that I have to go into the BIOS/UEFI every time I want to load the non-default installation. The boot menu was a bit more convenient ;(
Is there a solution for this too?

Thank you all for your great help!

Ideally (although not strictly required according to UEFI specifications), an $ESP for each OS (on each disk) would be preferable (an $ESP doesn’t strictly need to be the first partition on the disk, either, so creating it manually is a safe option).

With the previous suggestion in place, you then have the possibility of using refind as the initial boot manager to easily choose which $ESP (which Manjaro instance) to boot.

I’ve had a similar scenario in place myself for many years.

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Good idea… I’ll give it a try. I could try switching to UKI while I’m at it.

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