Public bug reported:

When I open the ubuntu software center, it just crashes.

I did some ultra basic debugging, and it appears to a be a problem while
starting "com.ubuntu.sso" service.

This happens every time I open USC. As of now, I USC is completely
useless for me..

λ ~/ software-center
Starting service by name:  com.ubuntu.Softwarecenter
2012-12-01 10:33:45,874 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 
'None'
2012-12-01 10:33:45,877 - softwarecenter.db.database - INFO - open() database: 
path=None use_axi=True use_agent=True
2012-12-01 10:33:46,160 - softwarecenter.backend.reviews - WARNING - Could not 
get usefulness from server, no username in config file
Starting service by name:  com.ubuntu.Softwarecenter
2012-12-01 10:33:46,269 - softwarecenter.ui.gtk3.app - INFO - 
show_available_packages: search_text is '', app is None.
2012-12-01 10:33:46,277 - softwarecenter.db.pkginfo_impl.aptcache - INFO - 
aptcache.open()
Starting service by name:  com.ubuntu.sso
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 243, 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 181, in 
activate_name_owner
    self.start_service_by_name(bus_name)
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 280, 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

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: software-center 5.2.6
ProcVersionSignature: Ubuntu 3.2.0-34.53-generic 3.2.33
Uname: Linux 3.2.0-34-generic x86_64
ApportVersion: 2.0.1-0ubuntu15
Architecture: amd64
Date: Sat Dec  1 10:25:14 2012
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 
(20120823.1)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: software-center
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: software-center (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug precise running-unity

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https://bugs.launchpad.net/bugs/1085425

Title:
  Crash in software-center when starting service com.ubuntu.sso

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