Comment 12 for bug 1785859

Installing the grub packages for this bug from the bionic-proposed repository removes grub-efi-amd64-signed and shim-signed. The removal of shim-signed seems to stop DKMS modules from being signed.

Start-Date: 2018-08-29 12:49:47
Commandline: apt dist-upgrade
Requested-By: nh (1000)
Upgrade: grub-common:amd64 (2.02-2ubuntu8.1, 2.02-2ubuntu8.4), grub2-common:amd64 (2.02-2ubuntu8.1, 2.02-2ubuntu8.4), grub-efi-amd64-bin:amd64 (2.02-2ubuntu8.1, 2.02-2ubuntu8.4), grub-efi-amd64:amd64 (2.02-2ubuntu8.1, 2.02-2ubuntu8.4)
Remove: shim-signed:amd64 (1.34.9.2+13-0ubuntu2), grub-efi-amd64-signed:amd64 (1.93.1+2.02-2ubuntu8.1)
End-Date: 2018-08-29 12:50:23

Downgrading to version 8.3 allows shim-signed to be reinstalled, and DKMS modules have signatures again.

> sudo apt install grub-common=2.02-2ubuntu8.3 grub2-common=2.02-2ubuntu8.3 grub-efi-amd64-bin=2.02-2ubuntu8.3 grub-efi-amd64=2.02-2ubuntu8.3 shim-signed=1.34.9.2+13-0ubuntu2 grub-efi-amd64-signed=1.93.4+2.02-2ubuntu8.3