Since no one here had a simple solution to this problem, I took the time, about 3-1/2 hrs. to re-install the system today. I still have a little tweaking to do. But at least the System Admin. menu is fully functional. That may be your only alternative. Post here if you come up with a simple solution. Have faith. Mint, like all other distros, is a continuing work in progress and FAR, FAR better than WIN. Thanks.