Ubuntu Tweak is a customization tool that lets you adjust fonts, GTK+ themes, and quite a bit more. Here's how you can install it in Ubuntu 14.04.
1. Open a terminal window.
2. Type in the following commands then hit Enter after each:
sudo add-apt-repository ppa:tualatrix/ppa
sudo apt-get update
sudo apt-get install ubuntu-tweak
3. You can start Ubuntu Tweak via the Unity Dash by simply typing in ubuntu tweak.
4. Use this command to remove Ubuntu Tweak:
sudo apt-get remove ubuntu-tweak
Image credit: Linux G
Source: Linux G
Additional resources for Ubuntu Tweak
Additional Ubuntu resources