Here is a guide that will show you how to install Ubuntu Tweak on Ubuntu 12.10. You can install Ubuntu Tweak by adding the Ubuntu Tweak Stable PPA to your system.
Ubuntu Tweak is an application to config Ubuntu easier for everyone. It provides many useful desktop and system options that the default desktop environment doesn’t provide. With its help, you will enjoy with the experience of Ubuntu! Read more about Ubuntu Tweak.
To add the PPA and install Ubuntu Tweak you need to open a terminal window (press Ctrl+Alt+T) and copy+paste the following lines:
sudo add-apt-repository ppa:tualatrix/ppa
sudo apt-get update
sudo apt-get install ubuntu-tweak
When Ubuntu Tweak is installed you can close the terminal window and press the SuperKey and type: ubuntu tweak