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Essentially, it doesn't support it, so you can't turn it off.
After a lot of trial and error I found out it was something (still don't know exactly what) in .cache/software-center. I think I should report it but I don't know to whom (ideas?). Anyway, if...
Edit the file /usr/share/gnome-shell/js/ui/panel.js
Comment out this line like so:
//'a11y': imports.ui.status.accessibility.ATIndicator,
...
Step1
Ubuntu provides a set of libraries and examples for using them to for a migration of simple menus...