[xubuntu] Restoring default video driver (Karmic 9.10)

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http://ubuntuforums.org – Hi, I installed the proprietary nvidia driver through the hardware drivers GUI, now my c840 Dell laptop screen won't boot up. It just remains blanc. I want to restore the driver to the default open-source one which worked. Can I do this through the command-line in recovery-mode? Or, how can I start up the desktop in low graphics mode and deactivate the proprietary nvidia driver? Thanks, Sam (Hardware)