The error in your log is:
Setting up shim-signed (1.37~18.04.1+15+1533136590.3beb971-0ubuntu1) ...
Installing for x86_64-efi platform.
grub-install: error: /boot/efi doesn't look like an EFI partition.
[1mdpkg:[0m error processing package shim-signed (--configure):
installed shim-signed package post-installation script subprocess returned
error exit status 1
The df information attached to your bug report confirms that you do not
have an ESP mounted at /boot/efi.
Why is your EFI System Partition not mounted?
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1792311
Title:
package shim-signed 1.37~18.04.1+15+1533136590.3beb971-0ubuntu1 failed
to install/upgrade: installed shim-signed package post-installation
script subprocess returned error exit status 1
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