title: Docker message: Automatically disabled Acquire::http::Pipeline-Depth due to incorrect response from server/proxy
body: <p>Installing apache2 into a Ubuntu 16.04 image of Docker , I am getting the follow message</p>
  
  <pre><code>W: http://archive.ubuntu.com/ubuntu/pool/main/g/gdbm/libgdbm3_1.8.3-13.1_amd64.deb: Automatically disabled Acquire::http::Pipeline-Depth due to incorrect response from server/proxy. (man 5 apt.conf).
  </code></pre>
  
  <p>That is the Dockerfile:</p>
  
  <pre><code>FROM ubuntu:16.04
  
  #RUN apt-get update
  #https://github.com/phusion/baseimage-docker/issues/319
  RUN apt-get update &amp;&amp; apt-get install -y --no-install-recommends apt-utils 
  RUN apt-get install -y apache2
  </code></pre>
  
  <p>When I open the image I see the <code>/var/www/html</code> folder, meaning, the apache was installed.</p>
  
  <p>What message is that? Is it an error or can I consider apache as fully installed? </p>