many errors on hp installation

[roberto <roberto03@gmail.com>]

hello,

i try to install the HP LaserJet 2600n printer and using hp-setup i
receive the following messages:
error: No devices found. Please make sure your printer is properly
connected and powered-on.
\error: PPD not file found. An appropriate PPD file could not be
found. Please check your HPLIP install, use <i>Select Other...</i>, or
download one from linuxprinting.org.
error: Printer queue setup failed. Please restart CUPS and try again.
error: Unsupported model: HP_Color_LaserJet_2600n
error: Printer Error. Printer is busy, offline, or in an error state.
Please check the device and try again.


i let the setup utility to find manually the printer and it actually
did, then i manually provided the ppd file and finally i get that
error message:
error: Printer queue setup failed. Please restart CUPS and try again.

also, i do not understand why it outputs:
error: Unsupported model: HP_Color_LaserJet_2600n

while the ppd file i provided is correct
i also read the bug report but it appears my problem is slightly different

any comments very welcome
thank you !
-- 
roberto