This article talk about graphics card installations. Installation can use two stages which are driver installation and device configuration. Sometimes, videocards are detected automatically (native support) but 3D acceleration support often need proprietary driver.
If you don't know your graphic card, visit hardware identification page to identify your card.
Technical words can be used but explained.
How to install AMD/ATI videocard (with 3D graphics support)
If your graphic card is etc. 2007 and newer, try uninstalling xserver-xorg-video-intel and use the builtin modesetting driver instead.
945GM - xserver-xorg-video-intel
nVidia and nouveau
#nouveau, official channel
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