[Bug 918788] Re: <type 'exceptions.AttributeError'>: 'NoneType' object has no attribute 'version'

[Apport retracing service]

*** This bug is a duplicate of bug 896689 ***
    https://bugs.launchpad.net/bugs/896689

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 #896689, 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

** Attachment removed: "Dependencies.txt"
   https://bugs.launchpad.net/bugs/918788/+attachment/2682814/+files/Dependencies.txt

** Visibility changed to: Public

** This bug has been marked a duplicate of private bug 896689

** Visibility changed to: Public

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https://bugs.launchpad.net/bugs/918788

Title:
  <type 'exceptions.AttributeError'>: 'NoneType' object has no attribute
  'version'

Status in “aptdaemon” package in Ubuntu:
  New

Bug description:
  1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> About Ubuntu
  Description:	Ubuntu precise (development branch)
  Release:	12.04

  2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center
  aptdaemon:
    Installed: 0.43+bzr756-0ubuntu1
    Candidate: 0.43+bzr756-0ubuntu1
    Version table:
   *** 0.43+bzr756-0ubuntu1 0
          500 http://us.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Crash
  DistroRelease: Ubuntu 12.04
  Package: aptdaemon 0.43+bzr756-0ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-9.16-generic 3.2.1
  Uname: Linux 3.2.0-9-generic x86_64
  NonfreeKernelModules: nvidia
  Annotation: Upgrading the system failed
  ApportVersion: 1.91-0ubuntu1
  Architecture: amd64
  Date: Thu Jan 19 11:25:56 2012
  DesktopFile: /usr/share/aptdaemon/aptdaemon.desktop
  DuplicateOf: https://bugs.launchpad.net/bugs/896689
  ExecutablePath: /usr/sbin/aptd
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20111129.1)
  PackageArchitecture: all
  SourcePackage: aptdaemon
  Title: <type 'exceptions.AttributeError'>: 'NoneType' object has no attribute 'version'
  TransactionDepends: [[], [], [], [], [], [], []]
  TransactionErrorCode: error-unknown
  TransactionKwargs: {'safe_mode': dbus.Boolean(True)}
  TransactionLocale:
   
  TransactionOutput:
   
  TransactionPackages: [[], [], [], [], [], []]
  TransactionRole: role-upgrade-system
  UpgradeStatus: Upgraded to precise on 2012-01-18 (0 days ago)

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