Same problem for me
I reinstalled software-center but no changes..

xxx@xxx-laptop:~$ software-center
2013-03-22 23:11:57,448 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 
'None'
2013-03-22 23:11:57,456 - softwarecenter.db.database - INFO - open() database: 
path=None use_axi=True use_agent=True
2013-03-22 23:11:57,651 - softwarecenter.fixme - WARNING - logs to the root 
logger: '('/usr/lib/python2.7/dist-packages/dbus/proxies.py', 410, 
'_introspect_error_handler')'
2013-03-22 23:11:57,651 - dbus.proxies - ERROR - Introspect error on 
com.ubuntu.sso:/com/ubuntu/sso/credentials: dbus.exceptions.DBusException: 
org.freedesktop.DBus.Error.Spawn.ChildExited: Process 
/usr/lib/ubuntu-sso-client/ubuntu-sso-login exited with status 1
Traceback (most recent call last):
File "/usr/bin/software-center", line 130, in <module>
app = SoftwareCenterAppGtk3(options, args)
File "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 337, in 
__init__
self.icons)
File "/usr/share/software-center/softwarecenter/ui/gtk3/session/appmanager.py", 
line 66, in __init__
self.oauth_token = helper.find_oauth_token_sync()
File "/usr/share/software-center/softwarecenter/backend/ubuntusso.py", line 
139, in find_oauth_token_sync
sso.find_credentials()
File 
"/usr/share/software-center/softwarecenter/backend/login_impl/login_sso.py", 
line 75, in find_credentials
self.proxy.find_credentials(self.appname, self._get_params())
File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 70, in __call__
return self._proxy_method(*args, **keywords)
File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 145, in __call__
**keywords)
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

After i have read your posts i tried this:

xxx@xxx-laptop:~$ U1_DEBUG=True /usr/lib/ubuntu-sso-client/ubuntu-sso-
login

Traceback (most recent call last):
  File "/usr/lib/ubuntu-sso-client/ubuntu-sso-login", line 66, in <module>
    from ubuntu_sso.main import main
  File 
"/usr/lib/python2.7/dist-packages/ubuntu-sso-client/ubuntu_sso/main/__init__.py",
 line 96, in <module>
    from ubuntu_sso.main import linux as source
  File 
"/usr/lib/python2.7/dist-packages/ubuntu-sso-client/ubuntu_sso/main/linux.py", 
line 464, in <module>
    from ubuntu_sso.main import qt
  File 
"/usr/lib/python2.7/dist-packages/ubuntu-sso-client/ubuntu_sso/main/qt.py", 
line 39, in <module>
    from PyQt4 import QtCore
RuntimeError: the sip module implements API v9.0 to v9.1 but the PyQt4.QtCore 
module requires API v8.1


What to do now, according to you?

Thanks

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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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