Fatal error: Uncaught Error: Class "Pdo\Mysql" not found in /usr/share/php/Icinga/Data/Db/DbConnection.php:208 Stack trace: #0 /usr/share/php/Icinga/Data/Db/DbConnection.php(83): Icinga\Data\Db\DbConnection->connect() #1 /usr/share/php/Icinga/Data/ResourceFactory.php(105): Icinga\Data\Db\DbConnection->__construct() #2 /usr/share/php/Icinga/Authentication/User/UserBackend.php(234): Icinga\Data\ResourceFactory::createResource() #3 /usr/share/php/Icinga/Authentication/AuthChain.php(248): Icinga\Authentication\User\UserBackend::create() #4 /usr/share/php/Icinga/Authentication/Auth.php(326): Icinga\Authentication\AuthChain->valid() #5 /usr/share/php/Icinga/Authentication/Auth.php(269): Icinga\Authentication\Auth->authExternal() #6 /usr/share/php/Icinga/Application/EmbeddedWeb.php(125): Icinga\Authentication\Auth->authenticate() #7 /usr/share/php/Icinga/Application/Web.php(279): Icinga\Application\EmbeddedWeb->setupUser() #8 /usr/share/php/Icinga/Application/Web.php(86): Icinga\Application\Web->setupUser() #9 /usr/share/php/Icinga/Application/ApplicationBootstrap.php(392): Icinga\Application\Web->bootstrap() #10 /usr/share/php/Icinga/Application/webrouter.php(107): Icinga\Application\ApplicationBootstrap::start() #11 /usr/share/icingaweb2/public/index.php(4): require_once('...') #12 {main} thrown in /usr/share/php/Icinga/Data/Db/DbConnection.php on line 208