title: Docker Upgrade from v1.11 to v1.12 using apt-get on Ubuntu 14.04.4 LTS
body: <p>I was trying to upgrade docker as is suggsted in <a href="https://docs.docker.com/engine/installation/linux/ubuntulinux/#upgrade-docker" rel="noreferrer">its manual</a></p>
  
  <pre><code>    sudo apt-get upgrade docker-engine
  </code></pre>
  
  <p>For some unknown reasons this will result in fetching and unpacking almost every package and library in my linux ( linux-images, lightdm, jvm,etc.). This has been going on for an hour now. </p>
  
  <p>Does anyone have any idea what is going wrong and how it can be stopped without messing up my Ubuntu installation?<br>
  ( in case you are planning to upgrade your docker using this, just don't. a purge an reinstall is a much better choice if you like your Ubuntu)</p>