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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.

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

This question was marked as an exact duplicate of an existing question.

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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