Downgrade to gnome 3.4

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http://askubuntu.com – I'm using Gnome Shell instead of Unity. Yesterday I upgraded to Ubuntu 12.10, which seems to work fine. However I'm very disappointed with the Gnome version that came with it. Many extensions and themes do not support Gnome 3.6. So, my upgrade feels like a step back when it comes to the user interface. Is there a way to downgrade to Gnome 3.4? (HowTos)