Traceback (most recent call last):
  File "/usr/lib/ubiquity/bin/ubiquity", line 232, in <module>
    main()
  File "/usr/lib/ubiquity/bin/ubiquity", line 229, in main
    install()
  File "/usr/lib/ubiquity/bin/ubiquity", line 67, in install
    wizard = ui.Wizard(distro)
  File "/usr/lib/ubiquity/ubiquity/frontend/mythbuntu_ui.py", line 81, in __init__
    del os.environ['UBIQUITY_MIGRATION_ASSISTANT']
  File "/usr/lib/python2.6/os.py", line 496, in __delitem__
    del self.data[key]
KeyError: 'UBIQUITY_MIGRATION_ASSISTANT'