[Bug 821467] This bug is a duplicate

[Apport retracing service]

Thank you for taking the time to report this crash and helping to make
Ubuntu better.  This particular crash has already been reported and is a
duplicate of bug #819350, 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.

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https://bugs.launchpad.net/bugs/821467

Title:
  software-properties-gtk crashed with AttributeError in
  toggle_source_use(): 'NoneType' object has no attribute 'disabled'

Status in “software-properties” package in Ubuntu:
  Triaged

Bug description:
  I got this when I was testing the oneiric alpha-3 live cd. I tried to
  disable a ppa, and then I got a crash message.

  ProblemType: Crash
  DistroRelease: Ubuntu 11.10
  Package: software-properties-gtk 0.81.4
  ProcVersionSignature: Ubuntu 3.0.0-7.9-generic 3.0.0
  Uname: Linux 3.0.0-7-generic i686
  Architecture: i386
  CasperVersion: 1.277
  Date: Fri Aug  5 13:31:03 2011
  ExecutablePath: /usr/bin/software-properties-gtk
  InterpreterPath: /usr/bin/python2.7
  LiveMediaBuild: Ubuntu 11.10 "Oneiric Ocelot" - Alpha i386 (20110803.1)
  PackageArchitecture: all
  ProcCmdline: /usr/bin/python /usr/bin/software-properties-gtk -n -t 67108872
  ProcEnviron:
   PATH=(custom, no user)
   LANG=ru_RU.UTF-8
   SHELL=/bin/bash
  PythonArgs: ['/usr/bin/software-properties-gtk', '-n', '-t', '67108872']
  SourcePackage: software-properties
  Title: software-properties-gtk crashed with AttributeError in toggle_source_use(): 'NoneType' object has no attribute 'disabled'
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

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