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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