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I'm new to Linux. My Ubuntu 13 is now meeting problem such the CPU rate is about 100% ever time and the System Drive Disk Usage is full. I think the virus is attacking my computer. Are there any ways i can do to restore it to the previous point or to make it new?

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If your system drive is full, then your cpu will go to 100%. This is not a virus, you need to clear some files. Try this to see where the space is being used: sudo du -shx /* –  Paul Jul 16 '13 at 9:56
    
Well, When i checked the disk for the first time, It is used up to 86%, after only a few minutes it raise up to 94% and my System is very slow. However, i'm going to use you command! :D –  So Pheakdey Jul 16 '13 at 9:58
    
Is the "System Drive Disk" your root (/) partition? What is taking up the CPU? You can check by running top. You can be almost certain it is not a virus, there are very few Linux viruses and none of them are really harmful. –  terdon Jul 16 '13 at 10:30
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While I cannot exclude that your computer has caught some malware, I doubt very much that your problems are caused by a virus. Or do you have other evidence, probably suspicious files? (In fact, most malware tries to act inconspicuously, and not alarming you with much activity.)

You should first try to find out which process is running amok on your system, e.g. by running top in a terminal window. It should show you the processes causing the most CPU load at the top. Your system drive is probably being filled with log data from this berserk process. You should look at typical places for that:

ls -l $HOME/.xsession-errors

and

ls -lSr /var/log/

are candidates for growing log files and could give you some hints. (-lSr means: 'l'ong listing, sort by 'S'ize, 'r'everse order, which means you get a long list of all files in /var/log/ with the largest ones listed last. )

Next step would be to find out what caused that process to misbehave. But that depends on the process. Only if that does not work I would think about reinstalling.

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