noctilux:

I just checked my debian-squeeze image file (that's the current one), and /etc/apt/sources.list has all the entries for sid. Perhaps you need to do an apt-get update? But it sounds as if you're doing that, so I'm not sure what the problem is. Perhaps try an apt-get -f install to see if you can get to a good, stable place, make sure you're online, do an apt-get update, and then try reinstalling the packages you're interested in.