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Knoppix 6.7 has all the necessary repositories pre-configured. All you need to do is reload the package definition and go to the synaptic GUI to perform the settings according to my previous post.

It's to do with what distribution you selected from synaptic. If you do this :-

Setting-->Preferences-->Preferred Version from "unstable",
( Also depends on your /etc/apt/sources.lst )

then...