Getting the latest NodeJS (14.x) is fairly straightforward for Ubuntu/Debian 16.04
$ sudo apt-get install software-properties-common
$ curl -sL https://deb.nodesource.com/setup_14.x | sudo -E bash -
References:
https://nodejs.org/en/download/package-manager/#debian-and-ubuntu-based-linux-distributions
https://github.com/nodesource/distributions/blob/master/README.md