sudo apt-get install --reinstall ubuntu-sso-client-qt 
The above statement produced no errors

/usr/lib/ubuntu-sso-client/ubuntu-sso-login-qt --app_name Test
Produced the following output:
Traceback (most recent call last):
  File "/usr/lib/ubuntu-sso-client/ubuntu-sso-login-qt", line 40, in <module>
    from ubuntu_sso.qt.main import main
ImportError: No module named ubuntu_sso.qt.main

apt-cache policy ubuntu-sso-client-qt python-ubuntu-sso-client
produced the following output:
ubuntu-sso-client-qt:
  Installed: 3.0.0-0ubuntu2
  Candidate: 3.0.0-0ubuntu2
  Version table:
 *** 3.0.0-0ubuntu2 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     3.0.0-0ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
python-ubuntu-sso-client:
  Installed: 3.0.0-0ubuntu2
  Candidate: 3.0.0-0ubuntu2
  Version table:
 *** 3.0.0-0ubuntu2 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     3.0.0-0ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages