What is the output of the following commands on your system?
which update-grub
dpkg -S `which update-grub`

You appear to have remnants of grub version 1 installed on your system.

** Changed in: grub (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1680707

Title:
  package linux-image-extra-4.4.0-71-generic 4.4.0-71.92 failed to
  install/upgrade: run-parts: /etc/kernel/postinst.d/zz-update-grub
  exited with return code 128

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