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My Sound drivers are not recognized by Ubuntu 12.10 and my web search tells me that the upgrade to xorg1.13 is the problem, but I don't know how to roll back the driver (or reinstall) xorg1.12.

Can someone provide me with some instructions on how to accomplish this?

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Aptitude can easily handle rollbacks. Note that you may have to rollback some dependencies as well, but the command you are looking for is roughly apt-get install xserver-xorg=1:7.6+12ubuntu1 (downgrading to the version used in precise).

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