gsettings set org.gnome.desktop.interface icon-theme 'elementary'

sudo sh -c "echo 'deb http://ppa.launchpad.net/papirus/papirus/ubuntu xenial main' > /etc/apt/sources.list.d/papirus-ppa.list"
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com E58A9D36647CAE7F
sudo apt update
sudo apt install -y papirus-icon-theme libreoffice-style-papirus
gsettings set org.gnome.desktop.interface icon-theme 'ePapirus'