Software Center exits on load

[Michael Barraclough]

This seems similar to some other bugs but they are supposed to be fixed and I am still not working.

Ubuntu 13.04

software-center:
  Installed: 5.6.0-0ubuntu3
  Candidate: 5.6.0-0ubuntu3
  Version table:
 *** 5.6.0-0ubuntu3 0
        500 http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu/ raring/main i386 Packages
        100 /var/lib/dpkg/status
     5.6.0-0ubuntu2 0
        500 http://us.archive.ubuntu.com/ubuntu/ raring/main i386 Packages

Symptom - software center starts to load and then exits. There are no error messages when loading from the launcher.

When loading via terminal I get

2013-10-13 16:42:16,914 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 'None'
2013-10-13 16:42:17,833 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file
2013-10-13 16:42:17,835 - softwarecenter.plugin - INFO - activating plugin '<module 'webapps_activation' from '/usr/share/software-center/softwarecenter/plugins/webapps_activation.pyc'>'
2013-10-13 16:42:17,839 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/gi/importer.py', 51, 'find_module')'
2013-10-13 16:42:17,839 - root - ERROR - Could not find any typelib for LaunchpadIntegration
2013-10-13 16:42:17,898 - softwarecenter.db.pkginfo_impl.aptcache - INFO - aptcache.open()
Traceback (most recent call last):
  File "/usr/bin/software-center", line 183, in <module>
    app.run(args)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 1375, in run
    self.show_available_packages(args)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 1313, in show_available_packages
    self.view_manager.set_active_view(ViewPages.AVAILABLE)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/session/viewmanager.py", line 150, in set_active_view
    view_widget.init_view()
  File "/usr/share/software-center/softwarecenter/ui/gtk3/panes/availablepane.py", line 240, in init_view
    vm.display_page(self, self.Pages.LOBBY, self.state)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/session/viewmanager.py", line 183, in display_page
    pane.enter_page(page, view_state)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/panes/availablepane.py", line 637, in enter_page
    self.display_lobby_page(state)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/panes/availablepane.py", line 652, in display_lobby_page
    self._clear_search()
  File "/usr/share/software-center/softwarecenter/ui/gtk3/panes/availablepane.py", line 559, in _clear_search
    self.searchentry.clear_with_no_signal()
  File "/usr/share/software-center/softwarecenter/ui/gtk3/widgets/searchentry.py", line 120, in clear_with_no_signal
    self.handler_block(self._handler_changed)
  File "/usr/lib/python2.7/dist-packages/gi/overrides/GObject.py", line 454, in signal_handler_block
    GObjectModule.signal_handler_block(_get_instance_for_signal(obj), handler_id)
  File "/usr/lib/python2.7/dist-packages/gi/types.py", line 113, in function
    return info.invoke(*args, **kwargs)
TypeError: argument instance: Expected GObject.Object, but got PyCObject