The error in your log is:
Setting up grub-efi-amd64-signed (1.66.28+2.02~beta2-36ubuntu3.28) ...
Installing for x86_64-efi platform.
grub-install: error: cannot find EFI directory.
Why is your ESP not mounted at /boot/efi?
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1894016
Title:
package shim-signed 1.33.1~16.04.6+15+1552672080.a4a1fbe-0ubuntu2
failed to install/upgrade: subprocess installed post-installation
script returned error exit status 1
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