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i intalled kubuntu 10.01, then ugraded to kubuntu 12.04 then after a while i used sudo apt-get install ubuntu-desktop in order to have a desktop environment just like a brand new installed ubuntu 12.04, but some of nice visual effects-like workspace switcher or messages about connecting to a network or a vpn connection establishing or failing that show in the top right of screen and they blur when mouse hovers them....- do not show as they should and they're so much simpler :|

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You probably need graphics card drivers. –  Seth Dec 7 '12 at 0:40
    
oh! looks like i'm running unity 2D :| !! i have a powerful graphic card ! –  MJafar Mash Dec 7 '12 at 7:06

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