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This question already has an answer here:

I have a new Dell's laptop E6430 with two VGAs (the Intel and nVidia).

I tried to download the file from the official site of nVidia but it caused the system to crash. I'm now on a new fresh system.

I need detailed instruction for safely installing the driver and also how to switch between the two cards.

marked as duplicate by aquaherd, Eric Carvalho, Seth, Radu Rădeanu, Basharat Sialvi Jun 24 '13 at 8:35

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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Your problem seems to be identical/very similar with this one: How can drivers for Nvidia graphics cards be installed on Ubuntu 13.04 without messing up the OS?

I think the answer I've wrote there might apply in your case as well.

Good luck and let us know what happens!

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