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Do you recall what was done before this happen ?
Have you tried system recovery ?
To be perfectly honest, it would be very hard to diagnose this issue, my suggestion is to save what ever you can and as fast as possible, and do a clean install. You don't know what has gone wrong and you will try to patch it up but I don't think it would be an stable system after word, so you better dodge the bullet before it is too late.
cheers
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