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See: http://www.knoppixforum.de/knoppix-forum-deutsch/ank%C3%BCndigungen-und-neuigkeiten/thread5236/debian-wheezy-ist-stable.html
and use Google translate (if you need it).

Greetings, Dave.

Debian has just changed the apt-get arrangements.
This may upset using it from Knoppix right now.
See Werner's recent news to this effect.

I suggest you hold off a few more...