title: Docker; Version '18.03.0.ce' for 'docker-ce' was not found
body: <p>I was trying to install Docker on Ubuntu runnig on Windows and I was following this official tutorial. <a href="https://docs.docker.com/install/linux/docker-ce/ubuntu/#install-docker-ce-1" rel="noreferrer">https://docs.docker.com/install/linux/docker-ce/ubuntu/#install-docker-ce-1</a>
  I could see the list of it available on my repo and then I put command <code>sudo apt-get install docker-ce=18.03.0.ce</code> like the turotial does. 
  But this error occured.
  The list actually shows the version like <code>docker-ce | 18.03.0~ce-0~ubuntu</code> but I cannot install.
  How am I wrong with it? Maybe I am making a dumb mistake.</p>