[Bug 751725] Re: software-center crashed with AptDaemonError in _medium_required(): org.debian.apt: Could not cancel transaction

[Parameswaran Sivatharman]

I get the same crash with the trace below,
(Fresh quantal 20121012 amd64 install -> Re-install quantal desktop  20121012 i386 keeping the personal files and then use software center to install any application e.g. virt manager)

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/defer/__init__.py", line 487, in _inline_callbacks
    result.traceback)
  File "/usr/share/software-center/softwarecenter/backend/installbackend_impl/aptd.py", line 957, in _medium_required
    yield transaction.cancel(defer=True)
aptdaemon.errors.AptDaemonError: org.debian.apt: Could not cancel transaction
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/defer/__init__.py", line 487, in _inline_callbacks
    result.traceback)
  File "/usr/share/software-center/softwarecenter/backend/installbackend_impl/aptd.py", line 957, in _medium_required
    yield transaction.cancel(defer=True)
aptdaemon.errors.AptDaemonError: org.debian.apt: Could not cancel transaction

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https://bugs.launchpad.net/bugs/751725

Title:
  software-center crashed with AptDaemonError in _medium_required():
  org.debian.apt: Could not cancel transaction

Status in “aptdaemon” package in Ubuntu:
  Confirmed
Status in “software-center” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: software-center

  unexpected crash

  ProblemType: Crash
  DistroRelease: Ubuntu 11.04
  Package: software-center 3.1.25
  ProcVersionSignature: Ubuntu 2.6.38-7.39-generic 2.6.38
  Uname: Linux 2.6.38-7-generic i686
  NonfreeKernelModules: nvidia
  Architecture: i386
  Date: Tue Apr  5 09:45:39 2011
  ExecutablePath: /usr/share/software-center/software-center
  InterpreterPath: /usr/bin/python2.7
  ProcCmdline: /usr/bin/python /usr/bin/software-center
  ProcEnviron:
   LANGUAGE=en_US:en
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  PythonArgs: ['/usr/bin/software-center']
  SourcePackage: software-center
  Title: software-center crashed with AptDaemonError in _medium_required(): org.debian.apt: Could not cancel transaction
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

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