Thanks for fast answer, but I read the instructions - sorry. And I did all:
1. apt-get purge foo2zjs
After that I deleted all ppd-Files in /usr/share/ppd/foo2zjs. No clj2600n was in the printers list to install jet.
2. Download and install the foo2zjs-package from foo2zjs.rkkda.com with './getweb 2600n', 'make install' and 'make cups'
3. Create a new CUPs-p
Forum: HP Color LaserJet 2600n