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ls /dev/tty*
The clue was in
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dmesg
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sudo systemctl stop brltty-udev.service
sudo systemctl mask brltty-udev.service
sudo systemctl stop brltty.service
sudo systemctl disable brltty.service
I believe brltty is installed by default in Debian, and its derivatives of which Ubuntu is one, and there are many derivatives of Ubuntu, so they have it too (pop!_os, mint, etc). I also think that both brltty and the HUZZAH32 feather want /dev/ttyUSB0 and that there is a .conf file somewhere that allows configuring brltty to use a different port, but I'll leave that exercise up to those who need it.
Hope this helps someone.