[ubuntu] blank desktop screen after login after installing ubuntu 12.10 on compaq evo n610c

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http://ubuntuforums.org – After installing ubuntu 12.10 permanently from windows xp professional It is a compaq evo n610c, and entering password login, it just shows a blank desktop screen. no icons, no upper left menu. nothiing. what to do ??? I am new to ubuntu and linux operated systems....do i need to go to an older version of ubuntu for ubuntu to work ??? here are more specs: http://h18000.www1.hp.com/products/q...11382_div.HTML (Hardware)