*** This bug is a duplicate of bug 1788727 ***
https://bugs.launchpad.net/bugs/1788727
That's precisely why the upgrade crashed: to prevent you from having an
unbootable system.
E: Your kernels are unsigned. This system will fail to boot in a secure
boot environment.
It even shows a big scary dialog on the desktop explaining all that.
** This bug has been marked a duplicate of bug 1788727
upgrade crashing due to unsigned kernels
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https://bugs.launchpad.net/bugs/1788368
Title:
package grub-efi-amd64 2.02-2ubuntu8.3 failed to install/upgrade:
installed grub-efi-amd64 package post-installation script subprocess
returned error exit status 1
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