[ubuntu] Unable to print certain .pdf

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http://ubuntuforums.org – Have just upgraded to 12.04 and find I am unable to print .pdf documents that have been created by scanning. These documents did print with 10.04. I have a dual boot system 12.04/WinXP and the same documents print satisfactorily in the WinXP side. Do I need to add some software so I can print any .pdf document regardless of its source? (Hardware)