Linux

Because there are so many different flavors and distributions of Linux available, installing Node isn't quite as straightforward. However, if you're running Linux to begin with, then you are more than aware of this and probably comfortable with a few extra steps.

Joyent has an excellent wiki on how to install Node on Linux using the many different package manager options available. This covers almost all the popular deb and rpm-based package managers. You can read that wiki by visiting https://github.com/joyent/node/wiki/Installing-Node.js-via-package-manager.

For Ubuntu 14.04 and preceding as an example, the steps to install Node would be as follows:

$ sudo apt-get install python-software-properties
$ sudo curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash -
$ sudo apt-get install nodejs

Once these steps have been completed, both Node and npm should be installed on your system.