Numix is a beautiful, simple icon and GTK theme available for Linux. For Ubuntu users, you can easily install Numix icons and GTK theme via PPA since the Numix developer provides PPA for Ubuntu 14.04 and all derivatives. Don’t forget to check my PPA collections on this blog.
Do the following command to install or add Numix PPA to Ubuntu 14.04 and its derivatives such as Xubuntu, Pinguy OS, Linux Lite, Elementary OS and so on.
sudo add-apt-repository ppa:numix/ppa
Don’t forget to update your system before installing packages from Numix PPA.