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I've recently installed Ubuntu 14.04 to my new notebook Lenovo Z50. But when booting up Linux Ubuntu, I get this error:

And when I try to install Nvidia's driver for GEForce 840M (v. 340.46 or older) the screen freezes. But without Nvidia's GPU drivers I get that nouveau error.

What can I do? Is there possibility that Ubuntu 14.04 gets an update which fixes that error for the devices which faces this error? Or is there any working workaround for this?

Lenovo Z50 Nvidia GeForce 840M Intel I7-4510U Graphics Intel® Haswell Mobile (The default one)

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Use a command like this

lspci -vnn | grep -i VGA -A 12

This will give you details about your VGA controller, if it is the Intel one (which I think it is) then do 

sudo apt-get install intel-linux-graphics-installer

Then run it this should remove the error.

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