[ubuntu] Another "Operating System Not Found"

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http://ubuntuforums.org – I've seen a number of threads which are tangential to this, but all seem to involve special dual operating systems, or such. If this should be addressed in another thread, please let me know. I am fairly computer literate, but not by any stretch a linux wizard. I have an Ubuntu system that has been running here for about 4 years, simply as a SVN repository, and to run apache and service an internal Wiki and some web pages. I have upgraded it periodically, and it is now at 12.04. The system is not intended as a dual boot, it's as plain-vanilla as I can get it. On Friday I noticed that it (Hardware)