I've tried to add unofficial Debian repositories with Synaptic, but I can't figure out the correct syntax when Synaptic (0.62.1.) asks for "the complete APT line". After every attempt Synaptic refuses to start before I remove the (erroneous) line manually from /etc/apt/sources.list.
How can I know what the syntax is for adding e.g. what's at http://unofficial.debian-maintainers.org/
I have lenny installed.