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I do not have a GPU, but still I experimentally installed nvidia-cuda-toolkit through the terminal like

sudo apt-get install nvidia-cuda-toolkit. 

nvcc command was working fine with sequential program after that. But ever since I restarted my laptop, I get the black screen. I tried to uninstall it like

sudo apt-get remove nvidia-cuda-toolkit

I then tried to purge the configuration since it did not work too.

sudo apt-get remove nvidia-cuda-toolkit

Finally I install aptitude and removed all the dependencies like

aptitude purge nvidia-cuda-toolkit

How would I fix this issue?

PS: I have a Windows 7 which is a dual OS and it is working fine.

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