[ubuntu] best way to install gnome 3

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http://ubuntuforums.org – What is the best way to install gnome 3 for 12.04. I've tried several methods and it still just hangs, when I login I get the background wallpaper screen but no icons, or taskbars so can not go any further. I'm running kernel 3.2.0-29-generic graphics driver is NVIDIA GT218 monitor is benq G2420HD I've read many faq's and tried numerous things but still no luck. Any suggestions most welcome. It might be best to diagnose where the problem is with current install but I don't know how. It gets so close to completing! Thanks Jim (Hardware)