The error in your log is:
Setting up shim-signed (1.34.7+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 do you have the shim-signed package installed? The error message
shows you do not have an EFI system partition mounted at /boot/efi, and
it appears your system is not in EFI mode.
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
** Summary changed:
- package shim-signed 1.34.7+13-0ubuntu2 failed to install/upgrade: installed
shim-signed package post-installation script subprocess returned error exit
status 1
+ (non-UEFI) package shim-signed 1.34.7+13-0ubuntu2 failed to install/upgrade:
installed shim-signed package post-installation script subprocess returned
error exit status 1
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https://bugs.launchpad.net/bugs/1766689
Title:
(non-UEFI) package shim-signed 1.34.7+13-0ubuntu2 failed to
install/upgrade: installed shim-signed package post-installation
script subprocess returned error exit status 1
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/shim-signed/+bug/1766689/+subscriptions
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