This morning I woke up and discovered my #Ubuntu had magically switched from #UnityDesktop to #Gnome (several months after install). Looked great, better native screenshot commands, Play & Previous/Next Track keys finally work.
But many small issues arose: unable to remap Calculator key, some custom .desktop files stopped showing icons and are not lockable on dashboard, cursor disappears in Chrome on click (?).
I rebooted to at least fix the cursor, and... it started on Unity desktop again.