I cannot install php composer in Ubuntu 16.04
<p>I have this error when I try to install composer:</p>

<p>Some settings on your machine make Composer unable to work properly.
Make sure that you fix the issues listed below and run this script again:</p>

<p>The openssl extension is missing, which means that secure HTTPS transfers are impossible.
If possible you should enable it or recompile php with --with-openssl</p>

<p>I followed this steps from my terminal in the Downloads directory:</p>

<pre><code>php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
php -r "if (hash_file('SHA384', 'composer-setup.php') === 'e115a8dc7871f15d853148a7fbac7da27d6c0030b848d9b3dc09e2a0388afed865e6a3d6b3c0fad45c48e2b5fc1196ae') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
php composer-setup.php
php -r "unlink('composer-setup.php');"
</code></pre>

<p>Just like the website says. What can I do now? I'm using Laravel but I need composer first. I have seen on internet that it's something to do with extensions but I don't know how to it.</p>

<p>Hope someone cal help me with this!</p>

<p>Thanks in advance.</p>