[Bug 1119369] Re: update-manager crashed with UnboundLocalError in show_diff(): local variable 'line_number' referenced before assignment

[Apport retracing service]

*** This bug is a duplicate of bug 1120322 ***
    https://bugs.launchpad.net/bugs/1120322

Thank you for taking the time to report this crash and helping to make
this software better.  This particular crash has already been reported
and is a duplicate of bug #1120322, so is being marked as such.  Please
look at the other bug report to see if there is any missing information
that you can provide, or to see if there is a workaround for the bug.
Additionally, any further discussion regarding the bug should occur in
the other report.  Please continue to report any other bugs you may
find.

** Tags removed: need-duplicate-check

** Changed in: update-manager (Ubuntu)
   Importance: Undecided => Medium

** Attachment removed: "ProcMaps.txt"
   https://bugs.launchpad.net/bugs/1119369/+attachment/3520590/+files/ProcMaps.txt

** Attachment removed: "ProcStatus.txt"
   https://bugs.launchpad.net/bugs/1119369/+attachment/3520591/+files/ProcStatus.txt

** This bug has been marked a duplicate of private bug 1120322

** Information type changed from Private to Public

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https://bugs.launchpad.net/bugs/1119369

Title:
  update-manager crashed with UnboundLocalError in show_diff(): local
  variable 'line_number' referenced before assignment

Status in “update-manager” package in Ubuntu:
  New

Bug description:
  While updating Steam, Software Updater crashed:
  ***
  "Replace your changes in '/etc/apt/sources.list.d/steam.list' with a later version of the configuration file? If you don't know why the file is there already, it is usually safe to replace it."
  ***
  Clicking on "Keep" or "Replace" does not change anything (Screenshot)

  ProblemType: Crash
  DistroRelease: Ubuntu 13.04
  Package: update-manager 1:0.181
  ProcVersionSignature: Ubuntu 3.8.0-4.9-generic 3.8.0-rc6
  Uname: Linux 3.8.0-4-generic i686
  ApportVersion: 2.8-0ubuntu4
  Aptdaemon:
   
  Architecture: i386
  Date: Fri Feb  8 13:43:21 2013
  ExecutablePath: /usr/bin/update-manager
  GsettingsChanges:
   b'com.ubuntu.update-manager' b'first-run' b'false'
   b'com.ubuntu.update-manager' b'launch-time' b'1360327262'
   b'com.ubuntu.update-manager' b'show-details' b'true'
   b'com.ubuntu.update-manager' b'window-height' b'432'
   b'com.ubuntu.update-manager' b'window-width' b'564'
  InstallationDate: Installed on 2013-01-30 (9 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha i386 (20130129)
  InterpreterPath: /usr/bin/python3.3
  MarkForUpload: True
  PackageArchitecture: all
  ProcCmdline: /usr/bin/python3 /usr/bin/update-manager
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  PythonArgs: ['/usr/bin/update-manager']
  SourcePackage: update-manager
  Title: update-manager crashed with UnboundLocalError in show_diff(): local variable 'line_number' referenced before assignment
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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