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Okay, so I recently installed Ubuntu 12.04LTS, and at first, Unity 3D worked fine. The Launcher was transparent, the bar at the top had the shadow, and everything looked really neat.

I don't remember why, but for some reason, when I logged in, I clicked on the Ubuntu symbol and chose Ubuntu 2D, and it looked horrible. I hated it, compared to Unity 3D. But I can't get back into 3D anymore. No matter what I do, I'm always running Unity 2D, even if I click on the Ubuntu symbol and select "Ubuntu".

Why am I stuck in Unity 2D even though I keep selecting the 3D one, and how do I fix that?

If it's worth anything, I'm using an nVidia GT440, with the proprietary drivers, version 303 or really close to that.

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marked as duplicate by Mitch, Kevin Bowen, user68186, aquaherd, Basharat Sialvi May 29 '13 at 18:26

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.

Can you run the following command and edit your question with the results. This is the command: /usr/lib/nux/unity_support_test -p – Max Tither Aug 17 '12 at 21:37
Yeah, ran that and it says Error: No Composite Extension. – Goldentoa11 Aug 17 '12 at 21:40

Actually, as I was browsing I ran across a LaunchPad issue that solved my problem.

sudo service lightdm stop
sudo nvidia-xconfig --composite
sudo service lightdm start
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I had the same problem of only loading 2D unity, after trying a few different things, I just followed this advice:

"Solved by updating everything and renaming xorg.conf to xorg.conf.old and running nvidia-xconfig as root"

From :

Hope it helps

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