I ran into the same issue on Debian 9.2, this is what I did to overcome it.
Installation
sudo apt install curl
curl -sL https://deb.nodesource.com/setup_6.x | sudo bash -
sudo apt-get install -y nodejs
sudo apt-get install -y npm
Check installed versions
node --version
npm --version
Originally sourced from "How to install Node.js LTS on Debian 9 stretch" http://linuxbsdos.com/2017/06/26/how-to-install-node-js-lts-on-debian-9-stretch/