Can't boot into windows after updating

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1

Ever since upgrading I believe yesterday, I can’t boot to Windows 10 from GRUB. When I select the WIndows 10 entry in the GRUB menu, a black screen appears saying “error: file ‘/EFI/Microsoft/Boot/bootmgfw.efi’ not found”. I tried changing the chainloading path in the Windows entry in grub.cfg but nothing worked.

I can boot into Windows from the BIOS menu, but not from GRUB.

EDIT: When editing the Windows entry directly from GRUB and pressing to complete the path to /EFI/Microsoft/Boot/bootmgfw.efi in the chainloader line, it doesn’t complete with the EFI directory. That means, I guess, that the Windows EFI partition is not being correctly mounted in GRUB? But my /etc/fstab has the correct UUID for the EFI partition, so I don’t really understand. I’m attaching my /etc/fstab file contents just in case.

Here’s the output of various commands, if you need more I’d be happy to provide.

Contents of /etc/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=1A94-42AC                            /boot/efi      vfat    umask=0077 0 2
UUID=f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652 /              ext4    defaults,noatime,discard 0 1
tmpfs                                     /tmp           tmpfs   defaults,noatime,mode=1777 0 0
UUID=0C86E5A686E5908E                     /mnt/Data      ntfs    rw,auto,users,exec,nls=utf8,umask=003,g

Output of sudo blkid:

/dev/sda1: PARTLABEL="Microsoft reserved partition" PARTUUID="4dc66a91-a0a5-4bcd-aed4-997becbc5846"
/dev/sda2: LABEL="DATA" BLOCK_SIZE="512" UUID="0C86E5A686E5908E" TYPE="ntfs" PARTLABEL="Basic data partition" PARTUUID="b4c0e754-0d60-4ef3-b221-dbcb852b564e"
/dev/sdb1: LABEL="ESP" UUID="1A94-42AC" BLOCK_SIZE="512" TYPE="vfat" PARTLABEL="EFI system partition" PARTUUID="922e013a-8050-4191-b289-d11254189dfa"
/dev/sdb2: PARTLABEL="Microsoft reserved partition" PARTUUID="51496300-10b4-4884-8759-53558e5847c0"
/dev/sdb3: LABEL="OS" BLOCK_SIZE="512" UUID="A636DBE636DBB611" TYPE="ntfs" PARTLABEL="Basic data partition" PARTUUID="b0e2b430-db4c-40d6-99cd-98d97bcbefe1"
/dev/sdb4: LABEL="WINRETOOLS" BLOCK_SIZE="512" UUID="DC82366182363FF6" TYPE="ntfs" PARTUUID="107772bc-e3bb-4229-b701-b380e164ca58"
/dev/sdb5: LABEL="Image" BLOCK_SIZE="512" UUID="E22A371E2A36EEE3" TYPE="ntfs" PARTUUID="423af344-2683-430d-86b8-771625380127"
/dev/sdb6: LABEL="DELLSUPPORT" BLOCK_SIZE="512" UUID="9C480A59480A3316" TYPE="ntfs" PARTUUID="1a5589c9-32f4-4e16-b6b7-ec0246885248"
/dev/sdb7: UUID="f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652" BLOCK_SIZE="4096" TYPE="ext4" PARTUUID="3b3d3471-1de3-4348-9327-ce377ba966d9"

Output of sudo fdisk -l:

Disk /dev/sda: 931,51 GiB, 1000204886016 bytes, 1953525168 sectors
Disk model: ST1000LM035-1RK1
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: CD6A0926-183D-4A33-9996-0EFCF4523C7B

Device      Start        End    Sectors   Size Type
/dev/sda1    2048     264191     262144   128M Microsoft reserved
/dev/sda2  264192 1953523711 1953259520 931,4G Microsoft basic data


Disk /dev/sdb: 119,24 GiB, 128035676160 bytes, 250069680 sectors
Disk model: SK hynix SC311 S
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: C4F3446C-1F96-438F-9932-2D5718DBD08D

Device         Start       End   Sectors  Size Type
/dev/sdb1       2048   1333247   1331200  650M EFI System
/dev/sdb2    1333248   1595391    262144  128M Microsoft reserved
/dev/sdb3    1595392 157749247 156153856 74,5G Microsoft basic data
/dev/sdb4  219189248 221216767   2027520  990M Windows recovery environment
/dev/sdb5  221216768 247769087  26552320 12,7G Windows recovery environment
/dev/sdb6  247771136 250048511   2277376  1,1G Windows recovery environment
/dev/sdb7  157749248 219189247  61440000 29,3G Linux filesystem

Partition table entries are not in disk order.

My grub.cfg is the following:

#
# 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="0"
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$feature_default_font_path = xy ] ; then
   font=unicode
else
insmod part_gpt
insmod ext2
set root='hd1,gpt7'
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt7' --hint-bios=hd1,gpt7 --hint-efi=hd1,gpt7 --hint-baremetal=ahci1,gpt7  f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652
else
  search --no-floppy --fs-uuid --set=root f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652
fi
    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_GB
  insmod gettext
fi
terminal_input console
terminal_output gfxterm
insmod part_gpt
insmod ext2
set root='hd1,gpt7'
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt7' --hint-bios=hd1,gpt7 --hint-efi=hd1,gpt7 --hint-baremetal=ahci1,gpt7  f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652
else
  search --no-floppy --fs-uuid --set=root f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652
fi
insmod gfxmenu
loadfont ($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=hidden
  set timeout=-1
# Fallback hidden-timeout code in case the timeout_style feature is
# unavailable.
elif sleep --interruptible -1 ; then
  set timeout=0
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 $menuentry_id_option 'gnulinux-simple-f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652' {
	savedefault
	load_video
	set gfxpayload=keep
	insmod gzio
	insmod part_gpt
	insmod ext2
	set root='hd1,gpt7'
	if [ x$feature_platform_search_hint = xy ]; then
	  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt7' --hint-bios=hd1,gpt7 --hint-efi=hd1,gpt7 --hint-baremetal=ahci1,gpt7  f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652
	else
	  search --no-floppy --fs-uuid --set=root f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652
	fi
	linux	/boot/vmlinuz-5.7-x86_64 root=UUID=f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652 rw  quiet apparmor=1 security=apparmor udev.log_priority=3
	initrd	/boot/intel-ucode.img /boot/initramfs-5.7-x86_64.img
}
submenu 'Advanced options for Manjaro Linux' $menuentry_id_option 'gnulinux-advanced-f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652' {
	menuentry 'Manjaro Linux (Kernel: 5.7.14-1-MANJARO x64)' --class manjaro --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.7.14-1-MANJARO x64-advanced-f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652' {
	savedefault
		load_video
		set gfxpayload=keep
		insmod gzio
		insmod part_gpt
		insmod ext2
		set root='hd1,gpt7'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt7' --hint-bios=hd1,gpt7 --hint-efi=hd1,gpt7 --hint-baremetal=ahci1,gpt7  f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652
		else
		  search --no-floppy --fs-uuid --set=root f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652
		fi
		linux	/boot/vmlinuz-5.7-x86_64 root=UUID=f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652 rw  quiet apparmor=1 security=apparmor udev.log_priority=3
		initrd	/boot/intel-ucode.img /boot/initramfs-5.7-x86_64.img
	}
	menuentry 'Manjaro Linux (Kernel: 5.7.14-1-MANJARO x64 - fallback initramfs)' --class manjaro --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.7.14-1-MANJARO x64-fallback-f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652' {
		load_video
		set gfxpayload=keep
		insmod gzio
		insmod part_gpt
		insmod ext2
		set root='hd1,gpt7'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt7' --hint-bios=hd1,gpt7 --hint-efi=hd1,gpt7 --hint-baremetal=ahci1,gpt7  f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652
		else
		  search --no-floppy --fs-uuid --set=root f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652
		fi
		linux	/boot/vmlinuz-5.7-x86_64 root=UUID=f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652 rw  quiet apparmor=1 security=apparmor udev.log_priority=3
		initrd	/boot/initramfs-5.7-x86_64-fallback.img
	}
	menuentry 'Manjaro Linux (Kernel: 5.7.14-1-MANJARO x64 - recovery mode)' --class manjaro --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.7.14-1-MANJARO x64-recovery-f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652' {
		load_video
		set gfxpayload=keep
		insmod gzio
		insmod part_gpt
		insmod ext2
		set root='hd1,gpt7'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt7' --hint-bios=hd1,gpt7 --hint-efi=hd1,gpt7 --hint-baremetal=ahci1,gpt7  f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652
		else
		  search --no-floppy --fs-uuid --set=root f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652
		fi
		linux	/boot/vmlinuz-5.7-x86_64 root=UUID=f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652 rw single 
		initrd	/boot/initramfs-5.7-x86_64-fallback.img
	}
	menuentry 'Manjaro Linux (Kernel: 5.4.57-1-MANJARO x64)' --class manjaro --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.4.57-1-MANJARO x64-advanced-f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652' {
	savedefault
		load_video
		set gfxpayload=keep
		insmod gzio
		insmod part_gpt
		insmod ext2
		set root='hd1,gpt7'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt7' --hint-bios=hd1,gpt7 --hint-efi=hd1,gpt7 --hint-baremetal=ahci1,gpt7  f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652
		else
		  search --no-floppy --fs-uuid --set=root f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652
		fi
		linux	/boot/vmlinuz-5.4-x86_64 root=UUID=f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652 rw  quiet apparmor=1 security=apparmor udev.log_priority=3
		initrd	/boot/intel-ucode.img /boot/initramfs-5.4-x86_64.img
	}
	menuentry 'Manjaro Linux (Kernel: 5.4.57-1-MANJARO x64 - fallback initramfs)' --class manjaro --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.4.57-1-MANJARO x64-fallback-f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652' {
		load_video
		set gfxpayload=keep
		insmod gzio
		insmod part_gpt
		insmod ext2
		set root='hd1,gpt7'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt7' --hint-bios=hd1,gpt7 --hint-efi=hd1,gpt7 --hint-baremetal=ahci1,gpt7  f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652
		else
		  search --no-floppy --fs-uuid --set=root f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652
		fi
		linux	/boot/vmlinuz-5.4-x86_64 root=UUID=f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652 rw  quiet apparmor=1 security=apparmor udev.log_priority=3
		initrd	/boot/initramfs-5.4-x86_64-fallback.img
	}
	menuentry 'Manjaro Linux (Kernel: 5.4.57-1-MANJARO x64 - recovery mode)' --class manjaro --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.4.57-1-MANJARO x64-recovery-f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652' {
		load_video
		set gfxpayload=keep
		insmod gzio
		insmod part_gpt
		insmod ext2
		set root='hd1,gpt7'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt7' --hint-bios=hd1,gpt7 --hint-efi=hd1,gpt7 --hint-baremetal=ahci1,gpt7  f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652
		else
		  search --no-floppy --fs-uuid --set=root f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652
		fi
		linux	/boot/vmlinuz-5.4-x86_64 root=UUID=f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652 rw single 
		initrd	/boot/initramfs-5.4-x86_64-fallback.img
	}
}

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

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

### BEGIN /etc/grub.d/30_os-prober ###
menuentry 'Windows Boot Manager (on /dev/sdb1)' --class windows --class os $menuentry_id_option 'osprober-efi-/dev/sdb1' {
	savedefault
	insmod part_gpt
	chainloader /EFI/Microsoft/Boot/bootmgfw.efi
}
set timeout_style=menu
if [ "${timeout}" = 0 ]; then
  set timeout=10
fi
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/30_uefi-firmware ###
menuentry 'UEFI Firmware Settings' $menuentry_id_option 'uefi-firmware' {
	fwsetup
}
### END /etc/grub.d/30_uefi-firmware ###

### 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/60_memtest86+ ###
if [ "${grub_platform}" == "pc" ]; then
    menuentry "Memory Tester (memtest86+)" --class memtest86 --class gnu --class tool {
        search --fs-uuid --no-floppy --set=root --hint-ieee1275='ieee1275//disk@0,gpt7' --hint-bios=hd1,gpt7 --hint-efi=hd1,gpt7 --hint-baremetal=ahci1,gpt7  f61b25a0-b8d8-47ef-b6b4-3fb74dbcb652
        linux16 /boot/memtest86+/memtest.bin 
    }
fi
### END /etc/grub.d/60_memtest86+ ###
2

Okay, I managed to start the Windows bootloader by changing the chainloader /EFI/Microsoft/Boot/bootmgfw.efi to chainloader (hd1,gpt1)/EFI/Microsoft/Boot/bootmgfw.efi in grub.cfg, but now it shows an error with status 0xc0000225 that reads “The Boot Configuration Data for your PC is missing or contains errors”.

3

can you return

sudo pacman -Qs grub 
sudo pacman -Qs os-prober 
inxi -Mxxa
sudo parted -l 
sudo efibootmgr -v
4

Here you go:

  • sudo pacman -Qs grub:
local/grub 2.04-11.1
    GNU GRand Unified Bootloader (2)
local/grub-theme-manjaro-dev 18.0-3
    Manjaro Linux grub theme (devel)
  • sudo pacman -Qs os-prober
local/os-prober 1.77-1
    Utility to detect other OSes on a set of drives
  • inxi -Mxxa
Machine:   Type: Laptop System: Dell product: G5 5587 v: N/A serial: <superuser/root required> 
           Chassis: type: 10 serial: <superuser/root required> 
           Mobo: Dell model: 0MJGJT v: A00 serial: <superuser/root required> UEFI: Dell v: 1.9.0 
           date: 02/11/2019
  • sudo parted -l 
Model: ATA ST1000LM035-1RK1 (scsi)
Disk /dev/sda: 1000GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system  Name                          Flags
 1      1049kB  135MB   134MB                Microsoft reserved partition  msftres
 2      135MB   1000GB  1000GB  ntfs         Basic data partition          msftdata


Model: ATA SK hynix SC311 S (scsi)
Disk /dev/sdb: 128GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags: 

Warning: failed to translate partition name
Number  Start   End     Size    File system  Name                          Flags
 1      1049kB  683MB   682MB   fat32        EFI system partition          boot, esp
 2      683MB   817MB   134MB                Microsoft reserved partition  msftres
 3      817MB   80,8GB  80,0GB  ntfs         Basic data partition          msftdata
 7      80,8GB  112GB   31,5GB  ext4
 4      112GB   113GB   1038MB  ntfs                                       hidden, diag
 5      113GB   127GB   13,6GB  ntfs                                       hidden, diag
 6      127GB   128GB   1166MB  ntfs                                       hidden, diag
  • sudo efibootmgr -v
BootCurrent: 0004
Timeout: 0 seconds
BootOrder: 0004,0001,0000,0005,0006,0007,0008
Boot0000* Windows Boot Manager	HD(1,GPT,922e013a-8050-4191-b289-d11254189dfa,0x800,0x145000)/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.}....................
Boot0001* ubuntu	HD(1,GPT,922e013a-8050-4191-b289-d11254189dfa,0x800,0x145000)/File(\EFI\ubuntu\shimx64.efi)
Boot0004* Manjaro	HD(1,GPT,922e013a-8050-4191-b289-d11254189dfa,0x800,0x145000)/File(\EFI\Manjaro\grubx64.efi)
Boot0005* Diskette Drive	BBS(Floppy,Diskette Drive,0x0)..BO
Boot0006* USB Storage Device	BBS(USB,USB Storage Device,0x0)..BO
Boot0007* CD/DVD/CD-RW Drive	BBS(CDROM,CD/DVD/CD-RW Drive,0x0)..BO
Boot0008* Onboard NIC	BBS(Network,Killer E2400 Boot    ,0x0)..BO
5

if the trouble is only for windows ,
you need a USB windows for repair boot entry EFI

6

Exact same issue. My dual boot setup was working well, but a recent update changed two things:

  1. Added a new “UEFI Settings” menu option to my Grub boot screen
  2. Killed my Windows entry, resulting in the exact same issue.

I wouldn’t immediately jump to “fix it with Windows USB” since that’s not where the problem originated.

I’m also investigating. OP, as you find solutions, please share here.

7

Okay, I managed to add a custom entry to GRUB to boot Windows. I added these lines at the end of /etc/grub.d/40_custom:

menuentry 'Windows Boot Manager (on /dev/sdb1) - Alt' --class windows --class os $menuentry_id_option 'osprober-efi-/dev/sdb1' {
	insmod part_gpt
	insmod chain
	set root=(hd1,gpt1)
	chainloader /EFI/Microsoft/Boot/bootmgfw.efi
}

The part after set root will depend on which disk and partition you have the Windows EFI partition. This can be checked with sudo parted -l I believe. In my case it was the first entry of the second disk, so hd1 instead of hd0 for the disk, and gpt1 for the first partition, according to what I understood.

I then ran sudo update-grub. On next restart, I used the new entry “Windows Boot Manager (on /dev/sdb1) - Alt” to open Windows, and it booted succesfully. You can change the entry name by changing the name of the menuentry.

The main difference with the entry I had earlier is that in the other one there’s no set root line. That maybe means then that os_prober can’t generate correct menuentries with EFI partitions located not on the first disk. This is probably a recent bug with os_prober then?

8

Nice, thanks.

Any chance the change can be made directly to the original entry which I believe is generated in 30_os-prober?

Perhaps embedded here:

  case ${LONGNAME} in
    Windows\ Vista*|Windows\ 7*|Windows\ Server\ 2008*)
    ;;
    *)
      cat << EOF
    drivemap -s (hd0) \${root}

Or introducing a new block for “Windows Boot Manager”

case ${LONGNAME} in
    Windows\ Boot\ Manager)
    ;;
    *)
      cat << EOF
    set root=XXXX
9

Tried that, didn’t work because those lines are inside this case:

case ${BOOT} in
    chain)

, which is not our case because ${BOOT}=efi. It does work if I write, beginning in line 205:


      case ${LONGNAME} in
	Windows\ Boot\ Manager)
	  cat << EOF
	set root=(hd1,gpt1)
EOF
	;;
      esac

, but that hardcodes the drive and partition. It would be nice if there were some variable that stored those things, but I can’t find one by skimming through the code, though I wasn’t very thorough.

EDIT: Fixed the code, it was doing the exact opposite of what I wanted.
EDIT2: It’s from line 205, not 208.

10

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