[ubuntu] nvidia installation help needed

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http://ubuntuforums.org – Am attempting to go to three monitors, thus installing two NVidia cards (9800GT and 8600) with Lucid Lynx. The motherboard does support two PCI-e cards. However, I can't seem to install latest Nvidia drivers. Downloaded latest driver from Nvidia website but can't get into console mode... or rather, when I enter Ctrl Alt F1 I have a blank screen. No command prompt. Nothing. Been searching here for a couple of hours and have gotten no where. Any assistance would be greatly appreciated. (Hardware)