==== Required information ====
- iRedMail version (check /etc/iredmail-release): 0.9.4
- Linux/BSD distribution name and version: Ubuntu 14.04.4 LTS
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? No
- Related log if you're reporting an issue:
====

We are trying to install the 2 step verification plug-in duo_auth but keep breaking the system, here are the steps we are taking;

Unpack plug-in to /opt/www/roundcubemail-1.1.4/plugins/duo_auth

Initialize the plug-in by  /opt/www/roundcubemail-1.1.5/config/config.inc.php by editing the following line:

// PLUGINS
$config['plugins'] = array('managesieve', 'password','duo_auth');

Then restart the system.

After restart we get the following error;

CONFIGURATION ERROR
config.inc.php was not found.
Please read the INSTALL instructions!

In tutorials it's mentioned that you should be initializing the plug-in through the "main.inc.php" file but I can't find this anywhere in the iredmail configuration.

Any ideas of what could be going wrong? Thank you.