title: Error in starting confluent in Ubuntu. confluent requires curl
body: <p>I have installed confluent 3.3.1 in Ubuntu 16.04LTS. I followed all the instructions to install confluent as per documentation. But, when I start confluent using "confluent start". I am getting an error 'confluent' requires 'curl'. What should I change to fix this issue. I have Java8 and Scala 2.11 in my system.</p>
  
  <p>This is the link i followed. </p>
  
  <p><a href="https://docs.confluent.io/current/installation/installing_cp.html#debian-and-ubuntu" rel="nofollow noreferrer">Install Confluent 3.3.1</a></p>
  
  <p><img src="https://i.stack.imgur.com/SGbOT.png" alt="confluent error screen"></p>