我刚刚升级了我的 Ubuntu 13.10，但 apache2 无法正常工作。当我尝试启动 apache2 服务器时，它打印以下错误：
* Starting web server apache2
* The apache2 configtest failed.
Output of config test was:
apache2: Syntax error on line 263 of /etc/apache2/apache2.conf: Could not open configuration file /etc/apache2/conf.d/: No such file or directory
Action 'configtest' failed.
apache2 ×1