Comment 2 for bug 869546

Actually I need something working so I can set ubunty-2d as default this week. I am thinking of diverting /usr/share/xsessions/ubuntu.desktop and adding /usr/share/xsessions/ubuntu-3d.desktop (with ubuntu-contents) because I notice that by default, greeter seems to select the lowest desktop file in alphabetical order. Thus, ubuntu-2d wins and is default,