Comment 1 for bug 856331

Ok, so the package there has a .override to define the key but that doesn't work since gsettings requires a schemas defining the key. It's easy to check, out of the .xsession-errors warning saying that ubuntuone is ignored a grep ubuntuone /proc/$(pidof gnome-settings-daemon)/maps shows it's not loaded indeed.

I've hacked a schemas to define the key locally and confirmed it fixes the issue