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How do I know whether my graphic drivers are installed or not

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http://askubuntu.com – I have installed Ubuntu 11.10 on my lenovo laptop and found a "chip" image on the top of the screen. It showed me to install 3 drivers ATI/AMD Proprietary FGLRX graphics drivers (post-release updates) Broadcom STA wireless drivers ATI/AMD Proprietary FGLRX graphics drivers When I installed 1st one, it showed me some error so, I installed 2nd one it was successful. I went to 3rd and it failed 1st time and later it worked.. After when I came back and found that it isn't not installed. I think these are for my ATI Radeon graphic drivers but don't know why its happening. If even found the "S (HowTos)