The error in your log is:
Setting up shim-signed (1.33.1+13-0ubuntu2) ...
Installing for x86_64-efi platform.
Could not delete variable: Invalid argument
grub-install: error: efibootmgr failed to register the boot entry: Block device
required.
dpkg: error processing package shim-signed (--configure):
installed shim-signed package post-installation script subprocess returned
error exit status 1
This failure suggests a bug in efibootmgr or in your firmware. Is the
problem reproducible? If you run 'sudo apt -f install', does it return
now without errors?
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1744424
Title:
package shim-signed 1.33.1+13-0ubuntu2 failed to install/upgrade:
installed shim-signed package post-installation script subprocess
returned error exit status 1
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