You have to edit your sources.list to get the debs from a kde woody mirror, www.apt-get.org is a good source for finding URI's for sources.list.

Be advised, there is quite a bit of manual intervention required to get the woody kde 3.1 debs working in Knoppix 3.1. You will have about 10 or so files that refuse to install, without forcing them to overwrite, on my computer I probably spent at least an hour (maybe almost 2) messing around getting things to install, if you can't get everything to install you'll have part 3.1 and part 3.04 (a mess).

What I did was apt-get install kdebase from a kde mirror then forced the install for each package that had overwrite errors using the dpkg --force overwrite ???? for each file that had install errors. Then you need to apt-get dist-upgrade to get the rest of the necessary packages. dist-upgrade will get any necessary packages that are needed when going from one version to another such as libraries etc.

Note: at this time my fonts are still all messed up and I only have two or three usable fonts in my knoppix install, on my woody based system at work KDE 3.1 installed perfectly and works fine (woody packages on a woody system).

rock