This tutorial is going to show you how to install Numix Theme and icons on Ubuntu 14.04 Trusty Tahr. As you know, Numix theme is a beautiful theme for Linux. It has a flat and simple theme. The steps to install Numix theme and icons on Ubuntu 14.04 is exactly the same with Ubuntu 13.10.
Use these commands to install Numix theme and icons on Ubuntu 14.04 Trusty Tahr
sudo add-apt-repository ppa:numix/ppa
sudo apt-get update
sudo apt-get install numix-gtk-theme numix-icon-theme-circle
sudo apt-get install numix-wallpaper-notd
Next, we need to install unity-tweak-tool
sudo apt-get install unity-tweak-tool
Next, open Unity Tweak Tool and click Theme
Now select Numix from theme list
Switch to Icons tab to change the Numix icon circle.
Here is the final result