Traceback (most recent call last):
  File "/usr/lib/ubiquity/bin/ubiquity", line 533, in <module>
    main(oem_config)
  File "/usr/lib/ubiquity/bin/ubiquity", line 520, in main
    install(query=options.query)
  File "/usr/lib/ubiquity/bin/ubiquity", line 238, in install
    wizard = ui.Wizard(distro)
  File "/usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py", line 253, in __init__
    self.locale = i18n.reset_locale(self)
  File "/usr/lib/ubiquity/ubiquity/i18n.py", line 47, in reset_locale
    di_locale = frontend.db.get('debian-installer/fallbacklocale')
  File "/usr/lib/python2.7/dist-packages/debconf.py", line 65, in <lambda>
    lambda *args, **kw: self.command(command, *args, **kw))
  File "/usr/lib/python2.7/dist-packages/debconf.py", line 101, in command
    raise DebconfError(status, data)
DebconfError: (10, "debian-installer/fallbacklocale doesn't exist")