Ok, here is the problem:

# /boot/efi was on /dev/sda1 during installation
# swap was on /dev/sda3 during installation

There is no fstab entry for /boot/efi, only a comment for it.

What does 'ls -l /etc/fstab' show?  (Specifically, we want to know when
this file was last modified)

Do you know why this entry was removed from your fstab?  Did you run any
third-party commands related to boot or filesystem configuration?

Once you have added this debugging information to the bug, you can
repair your system by running the following commands as root:

echo "UUID=$(blkid -ovalue -sUUID /dev/sda1)  /boot/efi  vfat  defaults  0  2" 
>> /etc/fstab
mount /boot/efi
apt -f install

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https://bugs.launchpad.net/bugs/1732515

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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