Thank you for responding to this, and Happy New Year.
So do not click on the handy install button. OK, got that.
I tried pip uninstall jupyterlab_spellchecker. It prompted for a Y then ran and reported Successfully uninstalled jupyterlab-spellchecker-0.7.2. I launched jupyter-lab which worked but part way down it suggested
[W 2021-12-30 12:01:46.755 LabApp] Build recommended
[W 2021-12-30 12:01:46.755 LabApp] @ijmbarr/jupyterlab_spellchecker needs to be included in build
I then ran pip install jupyterlab_spellchecker with a report of Successfully installed jupyterlab-spellchecker-0.7.2
jupyter serverextension list still reports
X is jupyter_nbextensions_configurator importable?
jupyterlab_spellchecker enabled
Tried jupyter server extension enable jupyterlab_spellchecker which reports
X Validation failed: [Errno 13] Permission denied: ‘/usr/etc/jupyter’
Note that I am using pip because conda errors out with a message about not having a base environment. Too many hours spent searching for help with that problem produced nothing useful. pip at least runs.
Should I uninstall jupyter and start the whole thing over?