Ubuntu and updating Docker
<p>I am trying to run the latest stable version of docker and docker-compose.</p>

<p>I am following the instructions on <a href="https://docs.docker.com/engine/installation/linux/ubuntulinux/" rel="noreferrer">https://docs.docker.com/engine/installation/linux/ubuntulinux/</a></p>

<p>Apparently the current version of docker-compose is 1.7. </p>

<p>Yet, after running through the documentation, installing docker-engine, I then get:</p>

<pre><code>$ docker-compose --version
docker-compose version: 1.4.0
</code></pre>

<p>And</p>

<pre><code>$ docker --version
Docker version 1.11.1, build 5604cbe
</code></pre>

<p>When I try to update it, I get the following:</p>

<pre><code>$ sudo apt-get upgrade docker-engine
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... docker-engine is already the newest version.
Done
</code></pre>

<p><strong>Update</strong></p>

<p>This just keeps getting stranger. After trying all of the advice below, I now get this:</p>

<pre><code>$ docker-compose -v
The program 'docker-compose' is currently not installed. You can install it by typing:
sudo apt-get install docker-compose
anton@Charles:~$ sudo apt-get install docker-compose
Reading package lists... Done
Building dependency tree       
Reading state information... Done
docker-compose is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
</code></pre>

<p>How then can I update docker?</p>