debian apt-get source list
hi folks. just a relatively quick question here. i installed knoppix onto the hd last night and tried to run apt-get update only to find that one of the sites was unaccessable and it wouldn't move on from there. how can i fix this? i know there is a source list somewhere but i'm not sure where it is or what it is called. also, is there somewhere that i can obtain a more current list of sources?
as always, TIA
p.s. oddly enough, i looked up apt-get as the search string on this site and got only 30 hits...most of which didn't relate to debian no less. how odd.