# curl --silent https://deb.nodesource.com/gpgkey/nodesource.gpg.key | sudo apt-key add -
deb https://deb.nodesource.com/node_4.x artful main
# deb-src https://deb.nodesource.com/node_4.x artful main
deb https://deb.nodesource.com/node_6.x artful main
deb https://deb.nodesource.com/node_7.x zesty main
deb https://deb.nodesource.com/node_8.x artful main
deb https://deb.nodesource.com/node_9.x artful main