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I installed Ubuntu 12.10 and it come with default VGA driver nouveau then I installed nvidia drivers and for some reason I choose the nouveau driver again

and want to come back to the nvidia drivers because nouveau have many problems like Ubuntu crash after sleeping

so the problem that Ubuntu refuse to activate nvidia again . how can i activate nvidia again

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Even I wanted them to activate but they just didnt so i reinstalled the drivers..you could remove them by using sudo apt-get purge nvidia-current and reinstall them by typing sudo apt-get install nvidia-current-updates –  Mukund Jan 1 '13 at 16:55
Please elaborate more on "refuse to reactivate nvidia". What exactly happens if you try? –  gertvdijk Jan 1 '13 at 17:26
nothing it freeze acting loading for many hours and nothing happen –  Eng.amr19 Jan 1 '13 at 19:38
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