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I have an old Intel Graphics card (from around 2002-2003). Compiz used to work fine until 9.10 but after 9.10, using Compiz via the terminal gives the following output and reverts to 2d interface:

Backend     : gconf
Integration : true
Profile     : default
Adding plugins
Initializing core options...done
Initializing bailer options...done
Initializing detection options...done
Initializing composite options...done
compiz (opengl) - Fatal: GLX_EXT_texture_from_pixmap is missing
compiz (opengl) - Fatal: Software rendering detected
compiz (bailer) - Info: Ensuring a shell for your session

Metacity compositing works fine but I really want to try out Unity in Natty. Is there any way to achieve this?

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Welcome to Ask Ubuntu! Welcome to Ask Ubuntu! We need more hardware information to help you, can you look at this question and then edit your question adding more detail?… – Jorge Castro Apr 16 '11 at 14:23
possible duplicate of How do I know if my video card can run Unity? – Jorge Castro Apr 23 '11 at 22:05

Looks like your graphic card doesn't support the level of OpenGL composting required by Unity.

In such a situation you can't use Compiz Unity (also known as Unity 3D) but you can get an experience nearly similar to that of Unity Compiz by installing unity-2d Install unity-2d. I have been using Unity 2D for quite some time and its very very similar to Unity 3D.

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An addition to Bilal's answer: Even if it does work, it will be very choppy. I speak from personal experience. – MarkovCh1 May 6 '11 at 15:54

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