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I recently set up a dual boot configuration with Windows 11 and Debian, and I've been using it without issues for a while. However, I've encountered a problem where the Windows 11 option has disappeared from the GRUB boot menu. I have already tried using 'sudo update-grub' with no success. I'm looking for assistance to understand why this happened and how I can fix it to have the Windows option show up in the GRUB menu again.

https://i.sstatic.net/c5BwV.png

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  • Can you share the output of efibootmgr and lsblk -f? (Run them as root / with sudo if possible.) The output of tree /boot/efi (if the directory / mountpoint exists) could give us some insight as well. (Also, can you confirm whether os-prober is still installed?)
    – Tom Yan
    Commented Oct 22, 2023 at 4:26
  • @TomYan here is a screenshot i.sstatic.net/c5BwV.png
    – itsmepvr
    Commented Oct 22, 2023 at 4:31
  • Can you confirm that you can still boot to Windows by choosing it on the UEFI boot menu? (Or sudo efibootmgr -n 0006 and reboot.) Any error/warning given by update-grub? Maybe try to reinstall os-prober, just in case.
    – Tom Yan
    Commented Oct 22, 2023 at 4:36
  • @TomYan I tried sudo efibootmgr -n 0006 and went into BIOS Flash update. After the grub doesnt show windows still. No error/warning given by update-grub.
    – itsmepvr
    Commented Oct 22, 2023 at 4:58
  • Can you clarify? You mean the 0006 entry led you to some BIOS (UEFI) screen, or it booted to Windows and you also tried updating your UEFI? If it's the former, it could be that your Windows Boot Manager is somehow corrupted / gone (which is why I asked for tree /boot/efi). (But it could be that your UEFI is somewhat "broken" as well; so it's better to try your UEFI boot menu instead.) You should at least check whether /boot/efi/EFI/Microsoft/Boot/bootmgfw.efi is still there.
    – Tom Yan
    Commented Oct 22, 2023 at 5:08

2 Answers 2

Reset to default
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Thanks for all the help. The issue is resolved. Added GRUB_DISABLE_OS_PROBER=false to the /etc/default/grub file and did update-grub.

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  • stack exchange tip: don´t type your reply into an answer form. instead add a comment to another answer or to the original question. Please cut out and delete this answer and paste it into an appropriate comment.
    – Elliptical view
    Commented Nov 23, 2023 at 20:41
  • this is the valid answer, I don´t think it is a reply, it is the answer to the problem
    – xCovelus
    Commented Dec 13, 2023 at 9:02
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As mentioned in this video, you can add Windows entry manually in Grub file(/etc/grub.d/40_custom).

https://www.youtube.com/watch?v=tyVRfVxiD08

menuentry "Windows" --class windows --class os {
    search --fs-uuid --no-floppy --set=root $UUID
  chainloader (${root})/EFI/Microsoft/Boot/bootmgfw.efi
}

Replace $UUID with the output of sudo blkid /dev/nvme0n1p1

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