====== Install Node.js (and NPM) ======


===== System update =====

<code>
> sudo apt-get update
</code>

If at this point you might get an error like
<code>
W: There is no public key available for the following key IDs:
XXXXXXXXXXXXXXXXXXXXXXX
</code>


We do not install "debian-keyring", which is big and 99% of the time unnecessary:
<code>
> sudo apt-get install debian-archive-keyring
> sudo apt-key update
</code>

The above will work, or not, depending on whether or not the key 'XXXXXXXXXXXXXXX' is present in the packages they indicate.

If you need a specific key, you have to get it, and know on which server to find it, it's in a key server (very probably any key server will do):
<code>
> sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys XXXXXXXXXXXXXXX
</code>

===== Packages Installation =====

We'll need curl first:
<code>
> sudo apt-get install curl
</code>

Then, to install Node.js (LTS is v4 at the time of this writing)
<code>
> curl -sL https://deb.nodesource.com/setup_4.x | sudo bash -
> sudo apt-get install -y nodejs
</code>

**That's it !**

You should now have node.js, as well as npm, installed on your system:
<code>
> node -v
v4.8.3

> npm -v
2.15.11
</code>