The error in your log is:
Setting up grub-efi-amd64-signed (1.66.20+2.02~beta2-36ubuntu3.20) ...
Installing for x86_64-efi platform.
grub-install: error: cannot find EFI directory.
dpkg: error processing package grub-efi-amd64-signed (--configure):
subprocess installed post-installation script returned error exit status 1
The mountpoint information included in your bug report confirms that you
do not have an EFI System Partition mounted on /boot/efi. Why don't
you?
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1810389
Title:
package shim-signed 1.33.1~16.04.1+13-0ubuntu2 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 1
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