The error in your log is:
Processing triggers for shim-signed (1.34.4+13-0ubuntu2) ...
No MOK found.
dpkg: error processing package shim-signed (--configure):
installed shim-signed package post-installation script subprocess returned
error exit status 1
I cannot see anything in your log which explains why shim-signed is
being triggered. What are the contents of /var/lib/dkms on your system?
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1766338
Title:
package shim-signed 1.34.4+13-0ubuntu2 failed to install/upgrade:
installed shim-signed package post-installation script subprocess
returned error exit status 1
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