The error in your log is:
Setting up shim-signed (1.34.9+13-0ubuntu2) ...
Installing for x86_64-efi platform.
grub-install: error: cannot find EFI directory.
dpkg: error processing package shim-signed (--configure):
installed shim-signed package post-installation script subprocess returned
error exit status 1
Why is /boot/efi not mounted on your system?
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1771725
Title:
package shim-signed 1.34.9+13-0ubuntu2 failed to install/upgrade:
installed shim-signed package post-installation script subprocess
returned error exit status 1
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