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Accidently I formated my /usr partition of my Kubuntu in my Windows XP systems.

Is there any way to revover the /usr partition?

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You could try your testdisk from your Live cd. :) – mikewhatever Nov 23 '12 at 12:35
Testdisk indeed. But /usr/ probably does not have any user content so as a last resort you could do a re-install without formatting/ Ofcouse you make a backup 1st before doing that ;) – Rinzwind Nov 23 '12 at 12:56
@mikewhatever. Once in a while, my /usr directory lived in my / partition, and my / partition had a btrfs file system. Through LiveCD I can see the snapshot of my / partition, and /usr is there. Can I recover my /usr partition from here? – kercker Nov 26 '12 at 9:40

Not really. As an exercise question in a job interview, maybe; as a practical thing, no - easiest thing to do is just back up any data you had and do a clean reinstall. (And don't delete system32 - er, I mean /usr - again.)

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