:~$ sudo software-properties-gtk
Traceback (most recent call last):
File "/usr/bin/software-properties-gtk", line 104, in <module>
app = SoftwarePropertiesGtk(datadir=options.data_dir, options=options, file=file)
File "/usr/lib/python2.7/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py", line 89, in __init__
SoftwareProperties.__init__(self, options=options, datadir=datadir)
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