Greetings, luther.

The current version of Knoppix is 7.2.
Unless you are a very seasoned linux user,
you should probably upgrade Knoppix by adopting this newer version rather
than try to upgrade your current system by upgrading your 7.0.3 versions's Synaptic.

This is a peculiarity of Knoppix that must be observed. See, for example:
http://knoppix.net/forum/showthread....hlight=upgrade