title: Composer Install : the requested PHP extension zip is missing from your system
body: <p>I want to install composer on the server, but I get an error 
  "the requested PHP extension zip is missing from your system".
  I have tried by typing the command</p>
  
  <pre><code>sudo apt-get install php7.1-zip
  </code></pre>
  
  <p>but get another error</p>
  
  <blockquote>
    <p>E: Unable to locate the php7.1-zip package E: Couldn't find any
    package by regex 'php7.1-zip'</p>
  </blockquote>
  
  <p>has anyone ever experienced it?</p>