I used to get the same exception. Running /usr/lib/ubuntu-sso-client
/ubuntu-sso-login manually resulted in the following exception:

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

It seemed to be a problem with python-sip and python-qt4. Re-installing
both packages fixed it for me.

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https://bugs.launchpad.net/bugs/1068680

Title:
  Software center does not start [dbus.proxies - ERROR - Introspect
  error]

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