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So Yesterday, I upgraded my 12.04.2 to 12.10 using the Update Manager. After the 3-hour download and installation was done, when the system booted up, everything got laggy, no display driver, however, on 12.04.2, even Steam detected a new driver. I added the PPA for the additional drivers and stuff, got some updates about them, but still laggy and its now getting really annoying, videos are laggy too. So my question is: How can I make Ubuntu as smooth as before on 12.04.2?

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