title: Install python3 in ubuntu 16.04 docker image
body: <p>I am trying to install python 3.6 in ubuntu 16.04 docker image. It was working fine before. But today it is started showing this error.</p>
  
  <pre><code>Step 8/14 : RUN add-apt-repository ppa:jonathonf/python-3.6
   ---&gt; Running in a27c7c55afef
   This PPA has been removed from public access as part of a protest against the abuse of open-source projects by large companies. For more detail visit the main page here: https://launchpad.net/~jonathonf
  
  If you are a company and you would like this PPA to continue then let me know your preferred route for contributions and I will arrange something.
  Ign:8 http://ppa.launchpad.net/jonathonf/python-3.6/ubuntu xenial/main all Packages
  Err:7 http://ppa.launchpad.net/jonathonf/python-3.6/ubuntu xenial/main amd64 Packages
    404  Not Found
  Ign:8 http://ppa.launchpad.net/jonathonf/python-3.6/ubuntu xenial/main all Packages
  Reading package lists...
  W: The repository 'http://ppa.launchpad.net/jonathonf/python-3.6/ubuntu xenial Release' does not have a Release file.
  E: Failed to fetch http://ppa.launchpad.net/jonathonf/python-3.6/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.
  </code></pre>
  
  <p>I am not sure about this. I didn't understand the problem. How I can solve this issue.</p>
  
  <p>My docker code below:</p>
  
  <pre><code>FROM ubuntu:16.04
  
  COPY requirements.txt /
  
  
  RUN apt-get update
  RUN apt-get install -y software-properties-common vim
  RUN add-apt-repository ppa:jonathonf/python-3.6
  RUN apt-get update
  
  RUN apt-get install -y build-essential python3.6 python3.6-dev python3-pip python3.6-venv python-dev libssl-dev swig
  RUN apt-get install -y git
  
  # update pip
  RUN python3.6 -m pip install pip --upgrade
  RUN python3.6 -m pip install wheel
  
  RUN pip install -r requirements.txt
  </code></pre>
  
  <p>Is anyone facing the same issue?</p>
  
  <p>Thanks in advance.</p>