Your PHP installation appears to be missing the MySQL extension which is required by WordPress. On Ubuntu 14.04 LTS
<p>Your PHP installation appears to be missing the MySQL extension which is required by WordPress</p>

<p>I tried to fix this problem by making sure MySQL server is running.</p>

<pre><code>/etc/init.d/mysql status
</code></pre>

<p>I found it is running properly.</p>

<p>Then I cheked for MySQL Module for php5 is installed</p>

<pre><code>dpkg --list | grep php5-mysql
</code></pre>

<p>and finally, I restarted the NGINX:</p>

<pre><code>/etc/init.d/apache2 restart
</code></pre>

<p>Still facing the same issue again and again:</p>

<p><strong>Your PHP installation appears to be missing the MySQL extension which is required by WordPress.</strong></p>