Comment 4 for bug 624927

Still happens with precise:

Traceback (most recent call last):
  File "/usr/bin/apt-add-repository", line 160, in <module>
    sp = SoftwareProperties(options=options)
  File "/usr/lib/python2.7/dist-packages/softwareproperties/SoftwareProperties.py", line 96, in __init__
    self.reload_sourceslist()
  File "/usr/lib/python2.7/dist-packages/softwareproperties/SoftwareProperties.py", line 584, in reload_sourceslist
    self.distro.get_sources(self.sourceslist)
  File "/usr/lib/python2.7/dist-packages/aptsources/distro.py", line 87, in get_sources
    raise NoDistroTemplateException("Error: could not find a "
aptsources.distro.NoDistroTemplateException: Error: could not find a distribution template