*** This bug is a duplicate of bug 1788727 ***
https://bugs.launchpad.net/bugs/1788727
So not sure if the error message is correct or enough clear. Indeed my
PC rebooted without problem because the new kernel 4.15 is signed. Only
some old kernels from 16.04 (4.4) was not signed and upgrade from 16.04
to 18.04 did not remove these obsolete kernels. I removed all 4.4
kernels after reboot without subsequent problem.
Best regards. JBF
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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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