Ok, so the problem is that your /boot/efi entry is commented out.

On Wed, Dec 13, 2017 at 07:28:17AM -0000, Michele Polese wrote:
> # /boot/efi was on /dev/sdc1 during installation
> #UUID=67E3-17ED  /boot/efi       vfat    umask=0077      0       1

Do you know why this is commented out?

What does 'ls -l /etc/fstab' show?

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Title:
  package shim-signed 1.32~16.04.1+0.9+1474479173.6c180c6-1ubuntu1
  failed to install/upgrade: subprocess installed post-installation
  script returned error exit status 1

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