im noob in linux, and recently i have installed ubuntu 11.10 but i've always work on gnome environment, i really want the gnome environment. Someone knows a reliable method to change unity to gnome
marked as duplicate by Jorge Castro, Marco Ceppi♦ Oct 22 '11 at 14:08
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If you're going for gnome2 then all you need to do is click on your username at login, at the bottom of the screen you'll see Ubuntu in a drop-box. Change it to Ubuntu Classic.
Ubuntu 11.10 no longer includes Gnome 2. Gnome 3 is included, but it is rather different from Gnome 2. Although there are ways to install Gnome 2, I doubt you can achieve good system stability with them, given that Unity runs atop Gnome 3, and Gnome 2 is no longer maintained. You can install Xfce, however. Enter this command in the terminal and then enter your password when prompted.
Xfce is different from Gnome 2 in some ways, but it is closer to Gnome 2 than anything that you can easily install. Click the gear next to your username when logging in, and select the Xfce option.