Thanks for the reply. I evidently mistyped the command in the message above, but I can report progress. I did a full clean reformat of my SD card, loaded a fresh copy of NOOBS onto it, booted the RPI, installed Raspian, sudo apt-get update, sudo apt-get install wolfram-engine and got a report that wolfram was up to date.
So I'm back to a functional demo system for tonight as long as I can borrow a wired mouse.
Thanks,
Fred
