title: mysql2 gem not working after updating to Ubuntu 16.04 - libmysqlclient.so.18
body: <p>Everything worked fine prior to the update.
  Using ruby 1.9.3p392 with RVM with rails (3.2.12)
  Using <strong>MySQL</strong> 5.7.16 and Nginx and Unicorn</p>
  
  <p>Log shows</p>
  
  <pre><code>LoadError: libmysqlclient.so.18: cannot open shared object file: No such file or directory - /home/bill/apps/xxx/shared/bundle/ruby/1.9.1/gems/mysql2-0.3.16/lib/mysql2/mysql2.so
  </code></pre>
  
  <p>I tried: </p>
  
  <ol>
  <li>uninstall/install mysql2 gem</li>
  <li>Running <code>bundle install</code></li>
  </ol>
  
  <p>Nothing worked. Anyone had that problem after updating ?</p>