what about "cat /etc/apt/soruces.list", I'm not entirely aware of that file (or apt in general) but if it's a file cat will list the contents of that file what list would try to list contents of a directory. I'd check on my computer but I just shut that one down ...
@Biker - It is pretty strange. I remember using LM for quite a while because everything just worked. MP3, video, dvds, samba shares, I don't think there was a single thing I had to change...it's too bad really.