title: Installing NodeJS 4.4.7 or later on Ubuntu 16.04 server
body: <p>In order to run a Meteor app created with the latest version of Meteor, I need to install Node.js 4.4.7 or greater on an Ubuntu 16.04 server. I have followed the instructions in the <a href="https://www.digitalocean.com/community/tutorials/how-to-install-node-js-on-ubuntu-16-04#how-to-install-using-a-ppa" rel="nofollow">DigitalOcean tutorial</a> exactly:</p>
  
  <pre><code>cd ~
  curl -sL https://deb.nodesource.com/setup_6.x -o nodesource_setup.sh
  sudo bash nodesource_setup.sh
  </code></pre>
  
  <p>However, when I execute the script, after a number of Get and Ign processes which seem to terminate without error, I get one <code>404 Not Found</code> error, and then notification about <code>Error executing command, exiting</code>:</p>
  
  <pre><code>...
  Ign:13 http://ppa.launchpad.net/chris-lea/node.js/ubuntu xenial/main Translation-en
  Err:7 http://ppa.launchpad.net/chris-lea/node.js/ubuntu xenial/main amd64 Packages
    404  Not Found
  Ign:9 http://ppa.launchpad.net/chris-lea/node.js/ubuntu xenial/main i386 Packages
  Ign:11 http://ppa.launchpad.net/chris-lea/node.js/ubuntu xenial/main all Packages
  Ign:12 http://ppa.launchpad.net/chris-lea/node.js/ubuntu xenial/main Translation-en_GB
  Ign:13 http://ppa.launchpad.net/chris-lea/node.js/ubuntu xenial/main Translation-en
  Fetched 190 kB in 2s (74.5 kB/s)
  Reading package lists... Done
  W: The repository 'http://ppa.launchpad.net/chris-lea/node.js/ubuntu xenial Release' does not have a Release file.
  N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
  N: See apt-secure(8) manpage for repository creation and user configuration details.
  E: Failed to fetch http://ppa.launchpad.net/chris-lea/node.js/ubuntu/dists/xenial/main/binary-amd64/Packages  404  Not Found
  E: Some index files failed to download. They have been ignored, or old ones used instead.
  Error executing command, exiting
  </code></pre>
  
  <p>I have been able to install NodeJS 4.2.6, using <code>sudo apt-get install nodejs</code> but I have been unable to update to a newer version. What am I missing?</p>