When you install Ubuntu you will need to manually install the video drivers because they do not have public sources, this means only the manufacturer of the graphic card knows everything about the piece of software. In order to have 3D acceleration you will need to install those drivers. Don't worry about the installation, it will be easier than you can imagine!
How to install drivers for ATI or nVidia video cards in Ubuntu:
1) Go to System > Administration > Hardware Drivers.
2) You will see a list of drivers, select one and press the Activate button.
3) Ubuntu will now download the driver and install it. Congratulations, you now have the drivers installed and can play games with some good framerates.
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