On further investigation, this does not appear to be a duplicate of bug
920196, but rather a different manifestation of a class of bug where the
apt cache is being accessed before it is ready.

I'll keep this open for tracing as we tackle the various failure cases
for this bug.

Thanks!

** This bug is no longer a duplicate of bug 920196
   software-center crashed with AttributeError in __contains__(): 'NoneType' 
object has no attribute '__contains__'

** Changed in: software-center
       Status: New => Invalid

** Changed in: software-center (Ubuntu)
   Importance: Undecided => Low

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https://bugs.launchpad.net/bugs/973379

Title:
  software-center crashed with AttributeError in __contains__():
  'NoneType' object has no attribute '__contains__'

Status in Ubuntu Software Center:
  Invalid
Status in “software-center” package in Ubuntu:
  Confirmed

Bug description:
  Apport says:

  ProblemType: Crash
  DistroRelease: Ubuntu 12.04
  Package: software-center 5.1.14.1
  ProcVersionSignature: Ubuntu 3.2.0-21.34-generic 3.2.13
  Uname: Linux 3.2.0-21-generic i686
  NonfreeKernelModules: wl
  ApportVersion: 2.0-0ubuntu4
  Architecture: i386
  CrashCounter: 1
  Date: Wed Apr  4 12:13:30 2012
  ExecutablePath: /usr/share/software-center/software-center
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
  InterpreterPath: /usr/bin/python2.7
  PackageArchitecture: all
  ProcCmdline: /usr/bin/python /usr/bin/software-center
  PythonArgs: ['/usr/bin/software-center']
  SourcePackage: software-center
  Title: software-center crashed with AttributeError in __contains__(): 
'NoneType' object has no attribute '__contains__'
  UpgradeStatus: Upgraded to precise on 2012-02-27 (36 days ago)
  UserGroups: adm admin cdrom dialout dip fax floppy fuse lpadmin plugdev 
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