[ubuntu] Cannot print, cannot see Printers menu element

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http://ubuntuforums.org – Suddently, two days ago, I couldn't print anymore. Printer is fine (it passed the auto-test), but no printer icon appears when I try to print a document. It happens in all applications. Moreover, "Printer" menu element in System>Administration does not appear any mores. Anybody can help me? (Hardware)