how to install gnome-classic in Precise?

Sun May 6 10:41:48 UTC 2012

I did a fresh install of Preciese and have 2 options Unity and Unity 2D. I guess I miss on this list how to install gnome-classic so I can have this option to continue as I could work in Ubuntu Natty while keep trying to use Unity 2D. How can I install gnome-classic and will it appear in the session list?
Milton
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