Hello,

it seems that i'm having similar problems. My situation is:

Knoppix 5.0.1 CD - Debian-like installed on harddisc, has no local printers, but access to two printers over LAN (there's another linux machine with printers (Canon BJC3000 and HP LaserJet-4l) running samba). Older Knoppix versions did that, but this one seems to have a somewhat magic CUPS. It sees the printers, but when i try to install them, it says me (after driver selection) that drivers couldnt be loaded / maybe they're not in their position or some access rights are missing. Well, i ran the KDE's printer setup tool for this, in admin mode. (so i should have root rights)

When i try to add the printer via http://localhost:631 it just shows me a small selection of drivers, and no Canon drivers at all. I added the HP Printer and sent out a testpage, bit its not printing, saying that printer is working and accepting printjobs, but "Unable to get printer status (client-error-forbidden)!". Well, again, i never changed anything on the server, access rights cannot be the reason, and it worked on the same hardware with older Knoppix (4.0.2) on the client.

I once tried to reinstall (and thus upgrade) eveything thats connected with cups via apt-get, but this didnt do the trick. I tried to reinstall the same version of cupsys*, but apt-get tells me that this version (1.1.23-15) cant be downloaded. ??? Well, i did apt-get update before, and apt-cache showpkg cupsys shows me this version available...:

Provides:
1.2.1-4 -
1.2.1-3 -
1.1.23-15 -
1.1.23-10sarge1 -

Well, i'll keep on trying and post when i got it ... but maybe someone else has more knowledge or luck