Leiche ! Das ist perfect ! \o/ !
All worked well and fast, I had the choice for the fastest repos (but don't pick ibiblio !!!) and the choice whether or not to enable megagames repos and the choice to keep or not the PASS server. I don't remember if apt-sources-update told me "do you want to overwrite the old sources.list" and "I will keep a backup of the old one... "
Have you kept theses 2 messages ?
It has opened Synaptic, and the Categories > repositories section window has been opened.
Very good job.