[gnome] loading gnome desktop

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http://ubuntuforums.org – I install ubuntu 12.04 and update all packages and add gnome repository and install gnome-shell, but when i logout and wnat to select the gnome desktop in login screen, i just have gnome classic and gnome classc(no effects) options to select and there is no gnome. what is the problem? how to solve it?:confused: and when i run Code: sudo gnome-shell --replace i got: Code: Window manager warning: Log level 16: Error getting session for the process we are in: GDBus.Error:org.freedesktop.ConsoleKit.Manager.GeneralError: Unable to lookup session information for process '3413' (g-io-error (Hardware)