*** This bug is a duplicate of bug 1788727 ***
https://bugs.launchpad.net/bugs/1788727
The error message is precisely there to prevent you from shooting
yourself in the foot and rebooting the system without a signed kernel
installed, as that won't boot (anymore).
** 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/1787216
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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