[ubuntu] only 2 choices of resolution

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http://ubuntuforums.org – hi after two days now trying to get my wifes laptop to accept ubuntu i have instsalled 8.04 on , the only problem is i can not adjust the resolution there i only 800x600 and 640x80 i have tried all different ways even tried to edit xorg resulting in a unbootable system any help will be welcome. the laptop is a advent celeron 1.73ghz 1 gig of ram 80 gig hard drive fully updated thanks (Hardware)