graphics unknown

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http://ubuntuforums.org – i just installed 12.04lts-64 bit & details sez graphics unknown i got a ati radeon hd4770 card searched for that & found a lot of complaints about drivers. i did find this: https://help.ubuntu.com/community/RadeonDriver which seems to tell everything but the name of the specific driver. whats the best way to proceed? (Hardware)