'Keyboard Shortcuts entry' force closes gnome-settings

Something hapened, and when I try t access Keyboard Shortcuts in the settings menu ( gnome-control-center).
The error I get is:
GLib-GIO-ERROR **: 09:33:33.618: Settings schema ‘org.gnome.shell.extensions.pop-shell’ is not installed
Trace/breakpoint trap (core dumped)
After this happens, I cannot start gnome control center until I do:
dconf reset -f /org/gnome/control-center/
Any idea what is going on, and how to fix it?

Seems you’ve installed a gnome shell extension, which is incompatible with Budgie desktop.

indeed.

Sounds like you are using pop-os where you have tried to uninstall stuff - but not fully.

OK, the good old reinstall did the trick.
I remember adding the pop_os ppa for (I think) gnome theme, probably that messed it up. The system is Ubuntu Budgie 20.04 upgraded from 18.04.