It is not a duplicate. I hope I successfully removed the duplicate
notice.

John, you are obviously hosted by OVH. The bug is due to a custom script by OVH.
I found the solution here:
http://forum.kimsufi.com/showthread.php?28294-etc-grub-d-06_OVHkernel-line-6 
Namely, in English:
Edit the file /etc/grub.d/06_OVHkernel
and replace update-grub_lib  with grub-mkconfig_lib.

(note that the OS is set as: OS="Ubuntu 10.10"! This script is old and
hasn't been updated in a long while!)

Then do: 
sudo dpkg --configure -a

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https://bugs.launchpad.net/bugs/1362723

Title:
  package grub-pc 2.02~beta2-9ubuntu1 failed to install/upgrade:
  ErrorMessage: subprocess installed post-installation script returned
  error exit status 1

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