In my install of Kali, the grub2 variable $prefix is set to (hd0,gpt3)/@/boot/grub

I need to alter its value for a system configuration.

Where is it declared and set to (hd0,gpt3)/@/boot/grub ?

Places I have looked:

  • /boot/efi/EFI/kali/ (there is no `grub.cfg` here)
  • /etc/grub.d/
  • /boot/grub/
  • /usr/share/bash-completions/completions/

A little more system information:

  • Using btrfs file system
  • dual booting ( Ubuntu + Kali ) from within a single btrfs partition