[Bug 1457353] Re: Software Updater freezes when trying to upgrade grub-pc package

[Brian Murray]

I've tried recreating this, using the test case you provided (thanks!),
and ensuring that libgtk2-perl was not installed.  However, the upgrade
(which included grub-pc) did not hang for me at all. Are you sure
modifying /etc/default/grub is sufficient?

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: Confirmed => Incomplete

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Title:
  Software Updater freezes when trying to upgrade grub-pc package

Status in ubuntu-release-upgrader package in Ubuntu:
  Incomplete

Bug description:
  Ubuntu version: 14.04.2

  When running Software Updater (update-manager) to update the packages,
  it freezes when trying to update grub-pc package.

  I think this is related to the fact that grub-pc detected a
  modification of a configuration file and needs to ask the user for
  confirmation on the action to take. However, the package required to
  display this (libgtk2-perl) is not installed by default.

  Steps to reproduce the problem:
  1 - install a fresh stock version of Ubuntu 14.04.2 on your device
  2 - modify the file /etd/default/grub (for instance, comment the line "GRUB_HIDDEN_TIMEOUT=0" or simply add a comment at the end of the file), then save and run `sudo update-grub2`
  3 - Restart the computer and start "Software Updater"
  Updates are being downloaded and installed. However when reaching grub-pc configuration, the window turns black and white and it has to be killed. (see attached screenshot update-manager-freeze.png)

  In order to fix the problem, before running the Software Updater, you
  need to install package `libgtk2-perl`. In that case, a new window
  will be displayed to ask what to do with the modified configuration
  file (see screenshot grub-gui-choice.png).

  Note that this problem does not happen when running the update through
  a terminal (sudo apt-get update && sudo apt-get dist-upgrade) because
  the grub modification confirmation is then displayed using ncurse.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.7
  ProcVersionSignature: Ubuntu 3.16.0-30.40~14.04.1-generic 3.16.7-ckt3
  Uname: Linux 3.16.0-30-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.10
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Thu May 21 15:09:54 2015
  InstallationDate: Installed on 2015-05-21 (0 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: dist-upgrade
  UpgradeStatus: No upgrade log present (probably fresh install)

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