You need to extract it without chrooting. Use the dpkg included with Knoppix to just extract it:
Code:
cd /tmp
dpkg --extract libc6_2.3.2.ds1-22sarge3_i386.deb
Then you can copy the individual files into the right places.
If that doesn't work either, you'll have to use "ar" to get the files out:
Code:
cd /tmp
ar x libc6_2.3.2.ds1-22sarge3_i386.deb
tar xzf data.tar.gz
Don't do either of these in a "real" directory, they will make a mess. Do it in /tmp or make a new directory as a scratch area.