Comment 4 for bug 1298793

An update to this. I notice that it crashes when trying to spawn /usr/lib/ubuntu-sso-client/ubuntu-sso-login

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

so I tried running this on its own and got
Traceback (most recent call last):
  File "/usr/lib/ubuntu-sso-client/ubuntu-sso-login", line 67, in <module>
    from ubuntu_sso.main import main
  File "/usr/lib/python2.7/dist-packages/ubuntu-sso-client/ubuntu_sso/main/__init__.py", line 39, in <module>
    from twisted.internet import defer
  File "/usr/lib/python2.7/dist-packages/twisted/__init__.py", line 53, in <module>
    _checkRequirements()
  File "/usr/lib/python2.7/dist-packages/twisted/__init__.py", line 37, in _checkRequirements
    raise ImportError(required + ": no module named zope.interface.")
ImportError: Twisted requires zope.interface 3.6.0 or later: no module named zope.interface.

I then tried to install zope.interface using synaptic but it was already installed.
Some searching had me thinking it should be installed in /usr/share/pyshared/zope/interface/
but this directory does not exist on my system even though there was a link to it in (sorry forgot where, I deleted it).

So seems to me the issue is with trying to get /usr/lib/ubuntu-sso-client/ubuntu-sso-login working