Ununtu 14.04 更新后重启 Apache 页面空白，禅道错误信息如下:

ERROR: could not find driver in /home/www/zentaopms/framework/router.class.php on line 1523, last called by /home/www/zentaopms/framework/router.class.php on line 1485 through function connectByPDO.
 in /home/www/zentaopms/framework/router.class.php on line 1567 when visiting 

PHP 和 Apache 均未错误日志。