[ubuntu] Dell Optiplex GX260 Video Driver Problem

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http://ubuntuforums.org – I install ubuntu on Dell Optiplex GX260 desktop. It can't detect video driver. How can I install video driver on my computer? I am not totally a newbie, know how to use terminal etc. So, if you share which code i have to use, I think i can install them. Thanx. I tried glxinfo | grep OpenGL result: Quote: OpenGL vendor string: Tungsten Graphics, Inc OpenGL renderer string: Mesa DRI Intel(R) 845G x86/MMX/SSE2 OpenGL version string: 1.3 Mesa 8.0.2 OpenGL extensions: cat /var/log/Xorg.0.log | grep DRI Quote: [ 39.666] (Hardware)