Low graphics mode followed by blank screen after upgrade

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http://ubuntuforums.org – I have a gazp8 that came with 13.04, so this is the first upgrade on this machine. When I boot up I get a box that says " the system is running in low-graphics mode. your screen, graphics card, and input device settings could not be detected correctly. You'll need to configure these yourself." It then asks me what I would like to do: run in low graphics mode for just one session, reconfigure graphics, troubleshoot the error, or exit to console login. Run in low graphics mode and exit to console login go to a black screen with a blinking cursor in the corner. The other options do (Hardware)