debian:/home/sia# software-properties-gtk 
/usr/lib/python2.5/site-packages/apt/__init__.py:18: FutureWarning: apt API not stable yet
  warnings.warn("apt API not stable yet", FutureWarning)
Traceback (most recent call last):
  File "/usr/bin/software-properties-gtk", line 100, in <module>
    app = SoftwarePropertiesGtk(datadir=data_dir, options=options, file=file)
  File "/var/lib/python-support/python2.5/softwareproperties/gtk/SoftwarePropertiesGtk.py", line 75, in __init__
    SoftwareProperties.__init__(self, options=options, datadir=datadir)
  File "/var/lib/python-support/python2.5/softwareproperties/SoftwareProperties.py", line 55, in __init__
    self.reload_sourceslist()
  File "/var/lib/python-support/python2.5/softwareproperties/SoftwareProperties.py", line 450, in reload_sourceslist
    self.distro.get_sources(self.sourceslist)    
  File "/usr/lib/python2.5/site-packages/aptsources/distro.py", line 85, in get_sources
    "Error: could not find a distribution template")
aptsources.distro.NoDistroTemplateException