Repairing Ubuntu

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http://askubuntu.com – Situation I have Ubuntu 12.10 , I have a lot of important files in it. They are about 120GB. Problem My Ubuntu Operating System is about to crash. Crashing Experience Sometimes the whole screens goes white. Sometimes the apps crashes , about every software have a chance to crash even terminal. Sometimes the whole screen Hangs What I want I want to a repair that can repair all my Softwares or only repair my operating system so that I can maintain my files. I want my OS to be back to the stable state no more crashes (HowTos)