I don’t know if the above is still the default, but I have this in my gnome setup scripts anyway:
gsettings set org.gnome.settings-daemon.plugins.media-keys screensaver “[‘<Control>q’]”
(IIRC it’s a terminal command because trying to bind ctrl-q in Settings will quit the Settings window. And you can’t unbind ctrl-q completely, so you have to bind it to something else. You could maybe add it as a custom launcher that just runs /bin/true.)
This says gnome has ctrl-q to quit applications:
https://wiki.gnome.org/Design/OS/KeyboardShortcuts
I don’t know if the above is still the default, but I have this in my gnome setup scripts anyway:
(IIRC it’s a terminal command because trying to bind ctrl-q in Settings will quit the Settings window. And you can’t unbind ctrl-q completely, so you have to bind it to something else. You could maybe add it as a custom launcher that just runs /bin/true.)