The error in your log is:
Setting up shim-signed (1.19~16.04.1+0.8-0ubuntu2) ...
Installing for x86_64-efi platform.
grub-install: errore: cannot find EFI directory.
dpkg: error processing package shim-signed (--configure):
subprocess installed post-installation script returned error exit status 1
Your bug report shows that you are on an EFI-based system, but the EFI
directory cannot be located. Please attach the /etc/fstab file from
your system to this bug report, and paste the output of the 'mount'
command.
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1620009
Title:
package shim-signed 1.19~16.04.1+0.8-0ubuntu2 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 1
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