Otherwise the boot related modules might be missing:
| * Missing addon file: "chain.c32" [ !! ]
| * Missing addon file: "hdt.c32" [ !! ]
| * Missing addon file: "mboot.c32" [ !! ]
| * Missing addon file: "menu.c32" [ !! ]
This is happening on grml-small where syslinux-common isn't
present by default because it's just a Recommends but not a Depends.
On grml-full we ship syslinux-common by default though because
it's a dependency of grub-imageboot.
rsync
rsyslog
strace
-syslinux
+syslinux syslinux-common
udev
usbutils
uuid-runtime