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

[Pierre Equoy]

Hi Brian,

I've installed Ubuntu 14.04.2 in a VM and I cannot reproduce the issue
anymore... Could it be that the packages are updated during
installation? In my original description there is not enough details
regarding the original versions of the update manager and other relevant
packages, so I'm not sure how to check this out.

If I remember correctly, we discovered an issue when testing an OEM
version (see lp:1454090), and I tried on a stock Ubuntu image and found
out I had a similar issue.

Not sure what could have changed since then that makes stock Ubuntu
14.04.2 work fine now...

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https://bugs.launchpad.net/bugs/1457353

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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