It worked! Thanks! I used the Software Update tool this rime. Last time I did the update from the command line using the apt-get update and apt-get upgrade. I doubt that made any difference, though.

Also, I tried to boot from a USB 3 thumb drive again. It boots, but the wifi still doesn't work (in either hot spot mode or connection to local wifi). I wonder if the the thumb drive is causing 2.4GHz interference? I may try a SSD or external USB wifi antenna to see if those will work. The USB boot isn't a deal breaker for me, just something I would like to do eventually.

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