Today, I was able to print a complex B&W test page using this driver: foo2hp: a linux printer driver for ZJS protocol (e.g. HP Color LaserJet 2600n)
Even if I was just only the person that test the results on that printer, It feels so good!!!

This is what happends when you buy a printer without double check if is supported by linux. When I bought it, I thought that if that printer uses a network interface, then I would not have any problem to print under linux ( that is a wrong thought).
Searching around, I found out that the official HP project HPLIP had not plans to support this printer in the near future :-( .
After a couple of emails the helpfull people at linuxprinting suggested to try Foo2zjs driver

I had contact the maintainer of the driver (Rick Richardson), but he could not be able to help me at that time (he had a stroke). Then I was lost in what to do, Hin-Tak Leung was able to start looking at the driver, when the week before last, Rick came back to scene and start coding and get partial result.

I think that I am the first person in the world to print a complex BW testpage with that printer as Rick does not have that printer, he was sending me file streams for me to test.

Today i am a happy man, Thanks Rick!!