The error in your log is:
Setting up grub-efi-amd64-signed (1.142.6+2.04-1ubuntu26.4) ...
Trying to migrate /boot/efi into esp config
Setting up shim-signed (1.40.4+15+1552672080.a4a1fbe-0ubuntu2) ...
dpkg: error processing package shim-signed (--configure):
installed shim-signed package post-installation script subprocess returned
error exit status 1
It appears the 1.40.3 version of shim-signed had successfully been
configured before this, and there are no packaging changes between
1.40.3 and 1.40.4. And there is no output to explain what has failed.
Is this problem reproducible if you run 'sudo dpkg --configure -a'?
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1896127
Title:
package shim-signed 1.40.4+15+1552672080.a4a1fbe-0ubuntu2 failed to
install/upgrade: installed shim-signed package post-installation
script subprocess returned error exit status 1
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