[ubuntu] Network printing problems

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http://ubuntuforums.org – Hi, I have a HP printer connected to a router (USB). I can print from Windows 7 and from Ubuntu 10.04 without any problem. I can not print from Ubuntu 12.04. Everytime I print I have an error asking if the printer is on at the print queue . I tryed everything I know to solve the problem but without sucess I'm using IPP protocol (Hardware)