Thank your for your bug report. This seems to be the result of local
misconfiguration, installing an unsigned kernel, and the script does
exactly what it was supposed to do.
If you need help with your system, consider using askubuntu, ubuntu-
users mailing list, the #ubuntu IRC channel on libera, or other user
support channels.
** Changed in: grub2-signed (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1975388
Title:
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
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