[ubuntu] GutenPrint interfering?

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http://ubuntuforums.org – My Ubuntu laptop is connected to a Windows network that has four shared printers. From the laptop I can print test pages, etc., with two of the printers. I cannot with the other two. On another machine, a Windows machine, also connected to the network, I can print to all four of the shared printers. So I know that the printers are fine. Looking at the drivers used by Ubuntu for the four printers, I see: Printer 1 uses an hpijs driver. This one works. Printer 2 uses an hpcups driver. This one also works. Printer 3 uses a CUPS+Gut (Hardware)