I have lenny with python-apt 0.7.7.1 I seem to have this bug.
this is the last few lines of terminal output when I run gksu --desktop /usr/share/applications/software-properties.desktop /usr/bin/software-properties-gtk "/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 -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]