Package: shim-signed:arm64 Version: 1.38+15.4-7 Please create a signed shim binary. Per https://wiki.debian.org/SecureBoot#arm64_problems this was disabled but should now be possible again: > Binutils 2.38 introduces support for PE/COFF generation on arm64 so it should now be possible to resolve > this situation. -- Liam Hopkins Google Compute Engine - Guest OS