title: Install Older Version of Mono
body: <p>Today my Ubuntu updated Mono to 4.2.1.102.  It will not allow a certain program I absolutely need to run.  How can I down-grade it to 4.0.5.1?  I have tried...</p>
  
  <pre><code>sudo apt-get install mono-complete=4.0.5.1
  </code></pre>
  
  <p>That doesn't work.</p>