"grub_is_Shim_lock_enabled not found"

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Then I suggest booting into a live environment, as you mentioned earlier, check if you are using BIOS or UEFI, then entering a chroot environment, and doing completing the above m mentioned reinstall accordingly:

How to chroot

  1. Ensure you’ve got a relatively new ISO or at least one with a still supported LTS kernel.

  2. Write/copy/dd the ISO to a USB thumb drive.

  3. When done, boot with the above mentioned USB thumb drive into the live environment.

  4. Once booted, open a terminal and enter the following command to enter the chroot environment:

manjaro-chroot -a
  1. If you have more than one Linux installation, select the correct one to use from the list provided.

When done, you should now be in the chroot environment.

But, be careful, as you’re now in an actual root environment on your computer, so any changes you make will persist after a restart.

Identifying whether your device uses BIOS or uEFI

Run the following in a terminal:

test -d /sys/firmware/efi && echo efi || echo bios

If the output is:

  • efi, your computer uses (u)EFI.
  • bios, your computer uses BIOS.

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