title: php7.1-zip installation under Ubuntu 18.04
body: <p>as the title already explains I need to install the zip module from php 7.1 under Ubuntu 18.04. When every I use the command </p>
  
  <pre><code>sudo apt-get install php7.1-zip
  </code></pre>
  
  <p>and the follwing output.</p>
  
  <pre><code>Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  Some packages could not be installed. This may mean that you have
  requested an impossible situation or if you are using the unstable
  distribution that some required packages have not yet been created
  or been moved out of Incoming.
  The following information may help to resolve the situation:
  
  The following packages have unmet dependencies:
   php7.1-zip : Depends: libzip4 (&gt;= 1.0) but it is not installable
  E: Unable to correct problems, you have held broken packages.
  </code></pre>
  
  <p>Trying to Install <code>libzip4</code> does not work either. </p>
  
  <pre><code>Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  Package libzip4 is not available, but is referred to by another package.
  This may mean that the package is missing, has been obsoleted, or
  is only available from another source
  
  E: Package 'libzip4' has no installation candidate
  </code></pre>
  
  <p>Can somebody please try to help. Google does not help with unfortunately either.</p>
  
  <p>Elias</p>