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The first time I installed Ubuntu 11.04, it said that my computer can't run Unity 3D. Now I upgraded my computer a little bit, and I want to try to enable Unity 3D again, but I don't know how. I'm using Unity 2D, if it helps out telling me how to fix it.

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maybe try logging out and selecting Ubuntu from the session menu then login make sure you have Ubuntu and not Ubuntu 2D selected – zeitue May 26 '12 at 5:47
Maybe try ubuntu 12.04... – Emerson Hsieh May 26 '12 at 6:44

This is what worked for me.

Open a terminal and try:

unity --reset

Get a terminal by Ctrl+Alt+F1.

Then do

sudo apt-get update
sudo apt-get upgrade
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