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I am using NVIDIA GeForce GT 520M

default nvidia-current can only boot into Unity 2D, Unity fails to load.

I tried proprietary version (285) and it can't get into lightdm at all until I removed xorg.conf, even after that I can only get into Unity 2D as well.

Finally I tried the ubuntu-x-swat PPA and still, logging in with Unity only defaults back to Unity 2D.

With all 3 drivers running the /unity_support_test -p command gets me 

Xlib:  extension "GLX" missing on display ":0".
Xlib:  extension "GLX" missing on display ":0".
Xlib:  extension "GLX" missing on display ":0".
Error: unable to create the OpenGL context

What can I do to get regular Unity running?

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See also How well do laptops with Nvidia Optimus work? for the background why your graphics cards fail and for solutions to run programs with it. However, Unity is currently not supported out-of-the box with the solutions provided. – Lekensteyn Oct 13 '11 at 19:48
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I have the same card and had the same problem. While nvidia doesn't provide support for optimus technology, which this card has, on linux, I did get unity 3d to work by just uninstalling all nvidia drivers with:

sudo apt-get --purge remove nvidia*

After rebooting, I had fancy effects and all. I hope it works for you too.

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protected by htorque Nov 17 '11 at 20:21

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