[ubuntu] ubuntu 12.04 doesn't recognize my graphic card driver

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http://ubuntuforums.org – I have always had trouble with my graphic on my dell dimension 4700. I change the screen resolution and that fix most of my problems but when I go into the details app on ubuntu it says for graphic unknown and for drivers unknown and experience standard. The status texts are always messed up, but now videos are messed up for youtube the sound keeps going but the picture freezes. I have chromium as my browser and adobe flash plug in. when I use movie player it corrupt the texts for everything and makes the screen blurred. I can live with it but it would be great if it could be fix. thanks for t (Hardware)