You didn't remove all the 177 packages, the headers package or so pulls
in a kernel and then apt switches to the unsigned one.
I'm going to reassign this to Linux, as we should ensure that doesn't
happen by not allowing unsigned to satisfy those dependencies.
** Package changed: grub2-signed (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: Invalid => New
** Summary changed:
- upgrade from 18.04 to 20.04 while on rollbacked kernel 4.15-0-177 - package
grub-efi-amd64-signed 1.167.2+2.04-1ubuntu44.2 failed to install/upgrade:
installed grub-efi-amd64-signed package post-installation script subprocess
returned error exit status 1
+ Removing signed kernel installs unsigned one due to dependencies
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https://bugs.launchpad.net/bugs/1975388
Title:
Removing signed kernel installs unsigned one due to dependencies
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