Network printer doesn't work under Ubuntu 14.04

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http://www.linuxquestions.org – All 3 of my thinkpads had Ubuntu 12 installed and my printer hp Officejet Pro connected to the router worked fine as a network printer. Now I installed Ubuntu 14.04 on all my computers and the printer will not be detected any more. I can only print when the printer is directly connected to the USB port of the computer. I tried it with hplip and Samba. With Samba the printer is detected (procedure is very slow) but a testpage will not print. Msg:" unable to communicate with device (code=12). Since Ubuntu 12 worked fine with network printers my question is what has changed in Ubuntu 14.0 (HowTos)