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I have tried all the propriety drivers and my I still don't see that it's installed under the system settings/system/details. I get unknown under the graphics section.How can I fix this. Please help.

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It doesn't really matter what it says under Details. Simply open the Additional Drivers utility and select the recommended driver, then click Activate. – mikewhatever Dec 19 '12 at 20:26

take a look here and I hope it works for you

See! it's easy ;)

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