title: Start crond.service on Ubuntu 16.04
body: <p>I am programming some schedule task in my Ubuntu 16.04.</p>
  
  <p>But when I try to start the crond.service by</p>
  
  <pre><code>sudo service crond start
  </code></pre>
  
  <p>I receive the message</p>
  
  <pre><code>crond.service
     Loaded: not-found (Reason: No such file or directory)
     Active: inactive (dead)
  </code></pre>
  
  <p>What's the problem? The tasks was added to the schedule by crontab command and look fine (the command works in the terminal, have the correct tree folder, I just added the day-hours parameters).</p>