Unfortunately, the logs in your bug report do not show the nature of the
failure.  The dpkg term.log says:

Log started: 2017-07-20  23:35:56
Log ended: 2017-07-20  23:36:39

and the history.log says:

Start-Date: 2017-07-20  23:35:56
Commandline: apt-get --no-upgrade -o 
Acquire::gpgv::Options::=--ignore-time-conflict -y install grub-efi-amd64-signed
Install: grub-efi-amd64-bin:amd64 (2.02~beta3-4ubuntu2.1, automatic), 
grub-efi-amd64:amd64 (2.02~beta3-4ubuntu2.1, automatic), 
grub-efi-amd64-signed:amd64 (1.80.1+2.02~beta3-4ubuntu2.1)
Upgrade: grub-common:amd64 (2.02~beta3-4ubuntu2, 2.02~beta3-4ubuntu2.1), 
grub2-common:amd64 (2.02~beta3-4ubuntu2, 2.02~beta3-4ubuntu2.1)
Error: Sub-process /usr/bin/dpkg returned an error code (1)
End-Date: 2017-07-20  23:36:39

If this problem is reproducible with 'dpkg --configure -a' or 'apt -f
install' from the commandline, we would need to see the output in order
to understand this bug.

** Changed in: shim-signed (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1705624

Title:
  package shim-signed 1.28+0.9+1474479173.6c180c6-1ubuntu1 failed to
  install/upgrade: subprocess installed post-installation script
  returned error exit status 1

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