title: read-only php.ini file is preventing saving new configuration
body: <p>I've installed <a href="http://www.mkfoster.com/2009/01/04/how-to-install-a-php-pecl-extensionmodule-on-ubuntu/" rel="noreferrer">"PHP PECL EXTENSION/MODULE ON UBUNTU"</a>. At the end, I was asked to add some configuration lines in the a file called <strong>php_ini</strong> that can be found in this path: </p>
  
  <pre><code>/etc/php5/apache2/php.ini
  </code></pre>
  
  <p>However, after making my changes, I can't save the file because the file is <strong>read-only</strong>. </p>
  
  <p>What the appropriate action to save my changes. I don't really why the file is read-only, I don't know if there is some thing I need to do. I'm new in Ubuntu/php</p>
  
  <p>Thanks for helping. </p>