Public bug reported:

The upgrade of grub failed during upgrade from xenial to bionic.

During the upgrade process I was presented a graphical debconf window with the 
devices to install grub on, but the elements in the list (sda and sda1) didn't 
have the checkboxes they were supposed to have to select either of these.
I still clicked next and got the warning that I was not going to install grub, 
then clicked next again and it cycled to the initial window.

In the end I closed the window and the upgrade continued.
Later in the upgrade process I was presented with the grub device choice again, 
and this time it was functional.

I think I remember seeing gtk / gdk warnings so I think something in the
toolkit stack was broken the moment debconf tried to make me choose a
grub device.

I can see 2 bugs :
- The broken / non functional debconf window at some point in the upgrade 
process.
- Why did I have to get this question in the first place for the upgrade ?

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: grub-pc 2.02-2ubuntu8
ProcVersionSignature: Ubuntu 4.15.0-12.13-generic 4.15.7
Uname: Linux 4.15.0-12-generic x86_64
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
Date: Sun Mar 18 23:58:00 2018
ErrorMessage: installed grub-pc package post-installation script subprocess was 
killed by signal (Aborted)
InstallationDate: Installed on 2013-01-11 (1892 days ago)
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 
(20120823.1)
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-12-generic 
root=UUID=30772cee-d50d-4e5f-a07a-00dc6295cfd9 ro quiet splash vt.handoff=1
Python3Details: /usr/bin/python3.6, Python 3.6.5rc1, python3-minimal, 3.6.4-1
PythonDetails: /usr/bin/python2.7, Python 2.7.14+, python-minimal, 2.7.14-4
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu1
 apt  1.6~beta1
SourcePackage: grub2
Title: package grub-pc 2.02-2ubuntu8 failed to install/upgrade: installed 
grub-pc package post-installation script subprocess was killed by signal 
(Aborted)
UpgradeStatus: Upgraded to bionic on 2018-03-18 (0 days ago)

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-package bionic

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https://bugs.launchpad.net/bugs/1756754

Title:
  package grub-pc 2.02-2ubuntu8 failed to install/upgrade: installed
  grub-pc package post-installation script subprocess was killed by
  signal (Aborted)

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