Installing CUDA + Opencv on Ubuntu 12.10

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Hi everyone!

Again, sorry for my bad English ^^

I wanted to use the gpu library in OpenCV so I've tried to install CUDA on Ubuntu 12.10

I've followed this guide http://docs.nvidia.com/cuda/cuda-getting-started-guide-for-linux/index.html but at the end, when I've restarted the SO, it was all fucked up: no title bar and application bar.

Is there a way to avoid all of this for future installations?

Thank you very much!