I was thinking about your system and I think I know how to fix it. See http://www.mail-archive.com/http://www.lists.debian.org/~debian-testing/msg02743.html I think the key will be to downgrade back to "stable". Presently, your system has mixed stable, testing, and unstable. (That's the way my system is set up.) Next time we have some free time, that's what we'll do to get everything working there.