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maks@ubuntu:~$ sudo dpkg-reconfigure software-center --force

[sudo] password for maks:

Updating software catalog...this may take a moment.

INFO:softwarecenter.db.pkginfo_impl.aptcache:aptcache.open()

Software catalog update was successful.

maks@ubuntu:~$ software-center

2012-09-13 22:24:01,370 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 'None'

2012-09-13 22:24:01,373 - softwarecenter.db.database - INFO - open() database: path=None use_axi=True use_agent=True

2012-09-13 22:24:01,588 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file

2012-09-13 22:24:01,687 - softwarecenter.ui.gtk3.app - INFO - show_available_packages: search_text is '', app is None.

2012-09-13 22:24:01,999 - softwarecenter.db.pkginfo_impl.aptcache - INFO - aptcache.open()

Traceback (most recent call last):

  File "/usr/bin/software-center", line 176, in <module>

    app.run(args)

  File "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 1422, in run

    self.show_available_packages(args)

  File "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 1352, in show_available_packages

    self.view_manager.set_active_view(ViewPages.AVAILABLE)

  File "/usr/share/software-center/softwarecenter/ui/gtk3/session/viewmanager.py", line 154, in set_active_view

    view_widget.init_view()

  File "/usr/share/software-center/softwarecenter/ui/gtk3/panes/availablepane.py", line 171, in init_view

    self.apps_filter)

  File "/usr/share/software-center/softwarecenter/ui/gtk3/views/catview_gtk.py", line 238, in __init__

    self.build(desktopdir)

  File "/usr/share/software-center/softwarecenter/ui/gtk3/views/catview_gtk.py", line 511, in build

    self._build_homepage_view()

  File "/usr/share/software-center/softwarecenter/ui/gtk3/views/catview_gtk.py", line 273, in _build_homepage_view

    self._append_recommended_for_you()

  File "/usr/share/software-center/softwarecenter/ui/gtk3/views/catview_gtk.py", line 481, in _append_recommended_for_you

    self.recommended_for_you_panel = RecommendationsPanelLobby(self)

  File "/usr/share/software-center/softwarecenter/ui/gtk3/widgets/recommendations.py", line 160, in __init__

    self._try_sso_login()

  File "/usr/share/software-center/softwarecenter/ui/gtk3/widgets/recommendations.py", line 224, in _try_sso_login

    self.RECOMMENDATIONS_OPT_IN_TEXT)

  File "/usr/share/software-center/softwarecenter/backend/login_sso.py", line 164, in get_sso_backend

    sso_class = LoginBackendDbusSSO(window_id, appname, help_text)

  File "/usr/share/software-center/softwarecenter/backend/login_sso.py", line 48, in __init__

    'com.ubuntu.sso', '/com/ubuntu/sso/credentials')

  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 241, in get_object

    follow_name_owner_changes=follow_name_owner_changes)

  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 248, in __init__

    self._named_service = conn.activate_name_owner(bus_name)

  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 180, in activate_name_owner

    self.start_service_by_name(bus_name)

  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 278, in start_service_by_name

    'su', (bus_name, flags)))

  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in call_blocking

    message, timeout)

dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: Process /usr/lib/ubuntu-sso-client/ubuntu-sso-login exited with status 1