thank you it worked 
but ive got another problem, my DVD-rom isnt really working, when i insert my dvd or cd linux stops working ( only mouse) and it starts working when i remove the cd, why is that?

but ive got another problem, my DVD-rom isnt really working, when i insert my dvd or cd linux stops working ( only mouse) and it starts working when i remove the cd, why is that?
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