• persistent 'unknown filesystem' error in grub

    I dual boot Antergos and windows 10. After Windows updated I rebooted to the grub rescue screen ‘unkown filesystem’.

    I was able to boot my machine using these commands.

    >set boot=(hd1,gpt5)
    >set prefix=(hd1,gpt5)/boot/grub
    >insmod normal

    At this point I’m presented with the normal grub boot options.

    After booting and logging in, I restarted but the ‘unknown filesystem’ error persisted.

    I then attempted to reinstall/update grub with these commands. After again booting in rescue mode and logging in.

    # sudo grub-install --target=x86_64-efi --efi-directory=esp --bootloader-id=GRUB --removeable
    # sudo grub-mkconfig -o /boot/grub/grub.cfg

    Both commands appeared to finish properly. But I still see the ‘unknown filesystem’ error.

    I have my Linux in three partitions.
    /dev/sda1 /efi
    dev/sda4 /home
    dev/sda5 /root

    When I boot all partitions mount properly including the efi partition.

    I double checked / root UUID in grub.cfg against /etc/fstab and it matches.

    Any suggestions on what might cause this persistent ‘unknown filesystem’ error in grub?

  • grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=Antergos-grub

    or do you setup something like this?

  • @broiniac
    Could you show us the output of commands:

    lsblk -fm
    fdisk -l

    There’s a lot of output, but don’t worry, forum software can handle it. ;)

  • And please add ‘sudo’ in front of the second and third command! :)

  • @joekamprad I used your install command without the --removable option and that seems to have fixed the problems. I also found unused files that weren’t being update and removed them from :

    /boot/efi/EFI/Boot # this contained bootx64.efi
    /boot/efi/EFI/antergos_grub # contained grubx64.efi

    The grubx64.efi wasn’t being updated. It may have been the --removable option that was causing the problems for me.

    Thanks for the help.

grub127 booting problem19 Posts 5Views 1039
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