安装完 bugzilla 之后 访问 url/bugzilla 之后没有出现登录界面，而是出现了index.cgi代码。
解决办法：
You can see if the directory /etc/apache2/mods-enabled/ has a symlink cgi.load. If there is no such symlink, you can create it by running
sudo a2enmod cgi
and then restart Apache:
sudo service apache2 restart
You can run man a2enmod to see what a2enmod does.
链接：http://askubuntu.com/questions/54251/how-do-i-make-apache-run-a-cgi-instead-of-showing-the-text
ubuntu 安装bugzilla---index.cgi show text
原文：http://my.oschina.net/mjRao/blog/365686