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prettier format on debian.md
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debian.md

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Debian

Reinstall GRUB with EFI firmware (from legacy BIOS installation)

From the Debian GRUBEFIReinstall pages:

  1. Boot using UEFI into a live environment.

  2. If /sys/firmware/efi/efivars is empty, reboot into the rescue system with the efi=runtime kernel parameter set. Then, mount the EFI variables in the live environment by running:

    mount -t efivarfs none /sys/firmware/efi/efivars

  3. Mount the system in the live environment, particularly the root and /boot/efi partitions.

  4. Bind-mount virtual filesystems:

    for i in /dev /dev/pts /proc /sys /sys/firmware/efi/efivars /run; do
 sudo mount -B "$i" /mnt"$i"
done

  5. Chroot into the system.

  6. Install grub-efi (and make sure that grub-pc-bin remains installed).

  7. Re-install GRUB:

    grub-install --target-i386-pc /dev/<DEVICE> --recheck
grub-install /dev/<DEVICE> --bootloader-id=<ID> --recheck

    Check that the EFI directory (/boot/efi) is not populated.

  8. Update the GRUB config file by running update-grub.

  9. Exit the chroot, unmount, and reboot.

Note: If the base system is LUKS-encrypted, make sure the device name used when unlocking is the same as the one used when unlocking during the normal boot sequence.