If you installed Knoppix from the CD (5.1.1), it's really missing some important files, such as:
1)linux-headers
2)MySQL-Server (it's already got MySQL-Client - which is useless without the server)

Its also got some bugs. Here's a solution to one of them:
1) "sudo" needs to be changed to "su" in your /home/[username]/.kde/share/config/kdesurc file... this will let U open synaptic & a bunch of other files.

Hope this helps.''

Chaz B.