[ubuntu] how to see if printer is compatible before purchasing?

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http://ubuntuforums.org – Hello, I installed Ubunto 9.1 but my Lexmark p4350 will not work with it. I checked the forums but nothing worked. I have been looking online at some HP Printers and was wondering if there is a way to see if it would be compatible with Ubunto before I purchase one. I wrote down the model numbers and checked to see if it was on the list that came up in system/administration/printing under new printer configuration. If the printer is listed does that mean it is compatible? Is there another way to find out? Thanks for any help, Monica (Hardware)