> sed: cannot rename /etc/default/sedpxc2lL: Operation not permitted
> dpkg: error processing package grub-efi-amd64 (--configure):
> installed grub-efi-amd64 package post-installation script subprocess returned 
> error exit status 4

Seems like there some problem with /etc/default/grub being edited using
sed but without more details of how this came about, this is non-
actionable.

** Changed in: grub2-unsigned (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/2126738

Title:
  package grub-efi-amd64 2.12-1ubuntu7.3 failed to install/upgrade:
  installed grub-efi-amd64 package post-installation script subprocess
  returned error exit status 4

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