My apologies if this is a duplicate post. My system is very unstable following a failed upgrade attempt. I was on 12.4, I believe, and was trying to go to the most current release. The upgrade hung and I am stuck with a terribly unstable system. I have no idea how to proceed. It has taken almost 20 minutes just to type this plea for help, due to the slowness of my system now. Any and all help would be greatly appreciated.