The system which i was tried, did not have lp0 port, I used to be tried to assign my printer to lp0 port, the method have lp1 port. when i changed command with sudo /usr/sbin/ccpdadmin -p LBP2900 -o /dev/usb/lp1 If these steps are unsuccessful to repair these common HP printer http://connect-hp-printer-to-wif67654.ampblogs.com/The-Definitive-Guide-to-dell-printer-tech-support-number-30334130