I want toreturn to gnome 3.4 from gnome 3.6 in ubuntu 12.04

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http://askubuntu.com – I installed ubuntu 12.04 and excited to experience Gnome 3.6. So I add repository and upgraded, But I think I have some graphical problem, So I prefer back to Gnome 3.4, I search in google but I can't find a good article ? (HowTos)