Greetings, Werner.

While it is true, I'd prefer to use Synaptic, the point I'm
trying to express here is that I think Synaptic is screwed-up
as of Knoppix 7 and needs to be fixed. Not a Knoppix problem,
but a Debian problem at the heart of it.

Ubuntu sees the problem tied to the EULA associated with
mscorefonts, and how recent Synaptic changes may have caused
this difficulty to develop.

Moreover, I think the Synaptic difficulty may carry over into
apt as well if your system has both installed.

If you have the CeBIT Knoppix 7, please try apt-get install on
mscorefonts and see if there's a problem. I don't have the CeBIT version.

I know apt always used-to-be an alternative to Synaptic.
In this current case, I'm not so sure.

Best regads.