When booting using UEFI then most entries (all the ones using linux16 for
loading, e.g. memtest) in the addons menu fail to boot with:

| error: file `/boot/grub/x86_64-efi/linux16.mod' not found
| error: can't find command `linux16'.

Can be reproduced also when doing normal/BIOS boot and choosing Addons -> "Run
Bootloader Grub2" and then there again "Addons" with the according linux16 entries:

| error: file `/boot/grub/i386-pc/linux16.mod' not found
| error: can't find command `linux16'.