[ubuntu] 64 bit 12.04 System Failure

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http://ubuntuforums.org – I have a multi-boot system with Windows 7, 32 bit 12.04 Ubuntu and 64 bit 12.04 Ubuntu. Until today, I was quite happy, using 64 bit Ubuntu almost 100% of the time. Then today, the 64 bit 12.04 system started giving me peculiar disk space warnings, and wouldn't run an mp4 video, and maybe some other irritants that I overlooked. So, I figure I'll just reboot, and see if this strangeness solves itself. Nope. I get some message about how the system can't configure the graphics or the input devices. I go round and round selecting all kinds of options about recovery and troubleshooting, gettin (Hardware)