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mag37 / Arch_tricks.md

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Rescue a borked Grub in Arch

Boot arch install usb

  • list devices with lsblk

mount root drive

  • if LUKS:
    • cryptsetup luksOpen /dev/sda2 myEncryptedVolume
    • mount /dev/mapper/myEncryptedVolume /mnt
  • if BTRFS:
    • mount -o subvol=@ /dev/sda2 /mnt
  • if LUKS+BTRFS:
    • mount -o subvol=@ /dev/mapper/myEncryptedVolume /mnt
  • if vanilla: - mount /dev/sda2 /mnt

mount boot drive

  • mount /dev/sda1 /mnt/boot

Chroot and re-install grub

# chroot to the root partition
arch-chroot /mnt
# reinstall grub
grub-install --target=x86_64-efi --efi-directory=/boot --bootloader-id=GRUB
# generate new grub config
grub-mkconfig -o /boot/grub/grub.cfg