Package: grub2 Version: 2.02~beta3-5 The stretch arm64 build of grub lacks the following commit (which happened after the -beta3 release): http://git.savannah.gnu.org/cgit/grub.git/commit/util/grub-mknetdir.c?id=0d663b50b9abf830fd10de384606a0632a605b77
This means that grub-mknetdir fails silently on arm64. This is already fixed in buster, but would be very nice if it could be included in future stretch releases.