Thanks to
https://github.com/grml/grml-live/commit/d3e8ff25fa98d39f794af4c8c151ca17f110bc6b the
addons are working fine in normal/BIOS boot again.

The Addons don't work in UEFI mode though as that's not possible as documented
at https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=651562#10

Considering the issue as resolved,
thanks everyone,
-mika-

Re UEFI: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=651562#10 (thanks,
Thomas Koehler for the hint).

Not sure what to do about the non-UEFI problem though, if no one comes up with a
fix for it I tend to drop the entries.

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'.