# curl -s https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add -
# OR
# wget -qO- https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add -

deb https://deb.nodesource.com/node_8.x xenial main
# deb-src https://deb.nodesource.com/node_8.x xenial main