These lines look like the important ones from the logs:
/boot/vmlinuz-4.15.0-1024-oem.efi.signed is signed, but using an unknown key:
Subject: CN = PPA canonical-kernel-team ppa
E: Your kernels are not signed with a key known to your firmware. This system
will fail to boot in a Secure Boot environment.
dpkg: error processing package grub-efi-amd64 (--configure):
installed grub-efi-amd64 package post-installation script subprocess returned
error exit status 1
Thanks
** Also affects: linux-signed-oem (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1845861
Title:
package grub-efi-amd64 2.02-2ubuntu8.13 failed to install/upgrade:
installed grub-efi-amd64 package post-installation script subprocess
returned error exit status 1
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