Ubuntu: How to install the Classic Desktop in Ubuntu 11.10 (Oneiric Ocelot)

Ubuntu 11.10 will not include the classic GNOME desktop which is available alongside Unity in Ubuntu 11.04. Ubuntu 11.10 will automatically use Unity as its default session and fall back to Unity 2D for those whose computers do not support 3D graphics. But if you truly want to go back to Ubuntu Classic Desktop without Unity, then this tutorial will show you how to do it easily. All that’s requires is installing a few extra packages and performing a tweak here and there.