I have a working Ubuntu 16.04 LAMP with postfix, dovecot and roundcube 1.2.0 installed. running really well.
Today I decided to install the carddav plugin into roundcube and now the webgui has crashed with the DATABASE ERROR: CONNECTION FAILED! error
I checked the config/config.inc.php for any changes, but other than the addition of the plugin at the bottom, I have changed nothing.
I can log into the roundcubemail database using phpmyadmin
I have restarted the services, and even rebooted the server itself too