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Thread: Windows Boot Manager missing from Grub2

  1. #1

    Default Windows Boot Manager missing from Grub2

    After running updates a while back, Windows 10 Grub option disappeared. It wasn't a problem.. until today.

    At first I received an error about hibernating when I tried to just browse the files. running ntfsfix /dev/sdaX a few times, and i could finally see the files and folders. However nothing I can find will make it re-add to the grub menu.
    os-prober returns nothing, with the windows partition mounted or unmounted.

    mount -t ntfs-3g -o remove_hiberfile /dev/sda3 /mnt/windows will mount it, but it doesn't help it find it for grub.

    Third, I went to the boot menu of the device (dell) and tried to readd as a UEFI option. However the \EFI\Windows folder is missing. Maybe that's normal.

    I've googled and googled but can't find an answer for this.

    Leap 15.1

  2. #2
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    Default Re: Windows Boot Manager missing from Grub2

    Does openSUSE use UEFI booting or legacy booting?

    Does Windows use UEFI booting or legacy booting?

    Those both need to boot the same way, if you want it to work.

    As far as I know, When you boot Windows with UEFI, there should be a directory (in the EFI partition)
    \EFI\Microsoft

    You appear to have looked for "\EFI\Windows" but that's the wrong name for UEFI booting of Windows.

    If this is a Dell computer, have you tried hitting F12 during boot to get a boot menu from the BIOS? (When I do that, I repeatedly hit F12 during boot so as to have a chance of getting the timing right).
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  3. #3
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    Default Re: Windows Boot Manager missing from Grub2

    Could it be that you had Windows fastboot disabled, but a Windows update re-enabled it?

    What does efibootmgr report?
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  4. #4

    Default Re: Windows Boot Manager missing from Grub2

    Quote Originally Posted by nrickert View Post
    Does openSUSE use UEFI booting or legacy booting?

    Does Windows use UEFI booting or legacy booting?

    Those both need to boot the same way, if you want it to work.

    As far as I know, When you boot Windows with UEFI, there should be a directory (in the EFI partition)
    \EFI\Microsoft

    You appear to have looked for "\EFI\Windows" but that's the wrong name for UEFI booting of Windows.

    If this is a Dell computer, have you tried hitting F12 during boot to get a boot menu from the BIOS? (When I do that, I repeatedly hit F12 during boot so as to have a chance of getting the timing right).
    It was in the menu and worked, hence, it disappeared

    Yes they both use UEFI to boot.

    Whatever the folder is called it's now missing from \EFI

  5. #5

    Default Re: Windows Boot Manager missing from Grub2

    Quote Originally Posted by mrmazda View Post
    Could it be that you had Windows fastboot disabled, but a Windows update re-enabled it?

    What does efibootmgr report?
    Mrmazda, it shows an entry for windows in UEFI at 0000. However when I try to manually add that entry through bios, the folder is missing from the \EFI folder. Only the opensuse, dell, and another called boot exist.

  6. #6
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    Default Re: Windows Boot Manager missing from Grub2

    If Windows bootloader is not present on ESP, it obviously cannot be added to grub menu. You likely need to boot from Windows installation medium and perform boot recovery.

    It is possible that copy of Windows bootloader is in \EFI\Boot. You may try booting it.

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