I have just installed the gnome-shell on my ubuntu 12.04. When I login I get this error:
GLib-GIO-ERROR: **: Settings schema 'gnome.org.desktop.a11y.magnifier' does not contain a key named 'invert-lightness'
Does anyone know how to fix this? Because of this error the gnome-shell doesn't start at all!
When I installed it I followed these instructions: http://www.filiwiese.com/installing-gnome-on-ubuntu-12-04-precise-pangolin/