Type "dmesg" to see the last few kernel messages. But that "Terminating selection process. No boot device found" says it all. Your root disk is failing. Make sure you have a good backup.

10.20 is a very old OS and it is not supported anymore. .

F**F = os is running
FA*F = load is 10 or above
F*1F = only one cpu

Boxes with displays like that are pretty old. A 9000/E240 or something like that is my guess. That is not supported anymore either.