Refer: https://itsfoss.com/install-numix-ubuntu/
Refer: https://www.gnome-look.org/p/1170667/
$ sudo add-apt-repository ppa:numix/ppa
$ sudo apt-get update
$ sudo apt-get install numix-gtk-theme numix-icon-theme-circle
The wallpapers no longer exist
$ sudo apt-get install numix-wallpaper-*
Original Defults
