[ubuntu] Ubuntu 12.04 won't recover to graphics mode

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http://ubuntuforums.org – Since I was getting slow performance with the proprietary nVidia drivers recommended in Additional Drivers control panel, I thought I'd try the post release drivers, which required a reboot. However, after reboot I get the command line prompt and not graphics mode. I've tried recovery mode and repair, but still get command prompt. Any suggestions to recover to the recommended drivers and get back to graphics mode? Bill (Hardware)