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I already solve it by re installing Ubuntu.

Yes sir, it is.

240146
I dont know how to uncheck it.

Yes. But I can only update things from the Terminal.
The Software Updater crashes every time I open it.

I already tried that. The terminal sends me this error.


W: Failed to fetch cdrom://Ubuntu 12.10 _Quantal Quetzal_ - Release i386 (20121017.2)/dists/quantal/main/binary-i386/Packages Please use...

When I try to open the Ubuntu Software Center the program just freezes there, only with a white screen in it. The problem started a day I was updating some software but my PC shutdown suddenly and...