[Bug 1750418] [NEW] package shim-signed 1.33.1~16.04.1+13-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

Public bug reported: During a normal `apt full-upgrade` I got the bug. The system was trying to Process triggers for dbus. Also, this boot took a really long time (for the first time). `systemd-analyze blame` blames `apt-daily- upgrade.service` for taking 1 minute 29 seconds to boot. ProblemType:

[Bug 1750418] Re: package shim-signed 1.33.1~16.04.1+13-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

OK. I worked around the bug by removing `shim` and `shim-signed` from my system (`apt remove shim shim-signed`). Also because I did this: https://superuser.com/questions/1171524 /possible-to-dual-boot-and-virtualize-same-physical-drive-containing- windows-10, I commented out automatic mounting of