Hello again.

I've got it working.

I don't know exactly what it was. I've done a few things:

The first time I've forgotten to deactivate swap in Knoppix (via bootoption noswap)
Now I deactivated it and copied the swap- and the linux-partition again.
After that I've done a fsck.ext3 -f on the linux-partition which didn't show any errors and now the Kanotix boots as it schould.

Just would let you know.

blubb