title: Unable to locate package while building Docker image
body: <p>During my Docker container build process, I attemptted to install a few packages using apt-get install. However the process failed to complete because the 3 of the 4 packages could not be found.</p>
  
  <pre><code>Step 1 : RUN apt-get update  &amp;&amp; apt-get install -y netcat  ca-certificates  build-essential  libssl-dev
   ---&gt; Running in 38d22d97ec4a
  Err http://http.debian.net jessie InRelease
  
  Err http://http.debian.net jessie-updates InRelease
  
  Err http://security.debian.org jessie/updates InRelease
  
  Err http://http.debian.net jessie Release.gpg
    Could not resolve 'http.debian.net'
  Err http://security.debian.org jessie/updates Release.gpg
    Could not resolve 'security.debian.org'
  Err http://http.debian.net jessie-updates Release.gpg
    Could not resolve 'http.debian.net'
  Reading package lists...
  W: Failed to fetch http://http.debian.net/debian/dists/jessie/InRelease
  
  W: Failed to fetch http://http.debian.net/debian/dists/jessie-updates/InRelease 
  
  W: Failed to fetch http://security.debian.org/dists/jessie/updates/InRelease
  
  W: Failed to fetch http://http.debian.net/debian/dists/jessie/Release.gpg  Could not resolve 'http.debian.net'
  
  W: Failed to fetch http://http.debian.net/debian/dists/jessie-updates/Release.gpg  Could not resolve 'http.debian.net'
  
  W: Failed to fetch http://security.debian.org/dists/jessie/updates/Release.gpg  Could not resolve 'security.debian.org'
  
  W: Some index files failed to download. They have been ignored, or old ones used instead.
  Reading package lists...
  Building dependency tree...
  Reading state information...
  E: Unable to locate package netcat
  E: Unable to locate package build-essential
  E: Unable to locate package libssl-dev
  Removing intermediate container 38d22d97ec4a
  2015/08/10 12:03:07 The command [/bin/sh -c apt-get update  &amp;&amp; apt-get install -y netcat  ca-certificates  build-essential  libssl-dev] returned a non-zero code: 100
  </code></pre>
  
  <p>At first, I thought this was an issue with my base image, however I have no issues building the container on another VM. Thoughts?</p>