[Bug 854818] Re: software-properties-gtk crashed with AttributeError in toggle_source_use(): 'NoneType' object has no attribute 'disabled'

[Kalsan]

Cannot remove the ticks on the left of the sources (added with add-apt-
repository), then crash.

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https://bugs.launchpad.net/bugs/854818

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
Status in “software-properties” source package in Precise:
  Triaged

Bug description:
  Reproduced this, with the following steps:
  1. Add PPA with add-apt-repository (adds both deb and deb-src)
  2. Remove PPA with add-apt-repository --remove (only removes deb entry , deb-src is left there, see bug #838507)
  3. Open Software sources and try to disable or remove the deb-src entry left there

  Expected result:
  The deb-src entry is removed
  What happens:
  Nothing, but the trace attached is written to stdout.

  ProblemType: Crash
  DistroRelease: Ubuntu 11.10
  Package: software-properties-gtk 0.81.9
  ProcVersionSignature: Ubuntu 3.0.0-11.18-generic 3.0.4
  Uname: Linux 3.0.0-11-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 1.23-0ubuntu1
  Architecture: amd64
  CheckboxSubmission: be2fbfde253285762d2d7eaf0e9f7c54
  CheckboxSystem: edda5d4f616ca792bf437989cb597002
  Date: Tue Sep 20 19:59:12 2011
  ExecutablePath: /usr/bin/software-properties-gtk
  InterpreterPath: /usr/bin/python2.7
  PackageArchitecture: all
  ProcCmdline: /usr/bin/python /usr/bin/software-properties-gtk --open-tab 2
  PythonArgs: ['/usr/bin/software-properties-gtk', '--open-tab', '2']
  SourcePackage: software-properties
  Title: software-properties-gtk crashed with AttributeError in toggle_source_use(): 'NoneType' object has no attribute 'disabled'
  UpgradeStatus: Upgraded to oneiric on 2011-09-20 (0 days ago)
  UserGroups: adm admin audio cdrom dialout dip floppy fuse plugdev sudo tape video

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