Extensions support is one on the most widely appreciated feature of GNOME Shell. In our previous post which listed
those stunning GNOME Shell themes, we all saw how difficult it is to do such trivial stuff like installing themes in GNOME
Shell. Well, there is a GNOME Shell extension called User-Theme Extension that makes everything about GNOME Shell theming
a lot simpler and easier, exactly how it should have been in the first place. Learn how to install GNOME Shell themes the
easier way in Ubuntu 11.10 Oneiric Ocelot.

How to Install Themes in GNOME Shell the Easier Way?

• Install GNOME Tweak Tool first of all, if you haven't already.

• Now install User-Theme GNOME Shell extension from PPA. For that, simply copy-paste the following commands into Terminal. 

sudo add-apt-repository ppa:ferramroberto/gnome3
sudo apt-get update
sudo apt-get install gnome-shell-extensions-user-theme