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Traceback (most recent call last):

  File "/usr/bin/add-apt-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