[ubuntu] service apache2 restart [fail]

$ /etc/init.d/apache2 restart
* Restarting web server apache2                                         [fail] 

解决办法4步走:

1. sudo /etc/init.d/apache2 stop

2. sudo killall apache2

3. sudo netstat -l|grep www   # 确认没有服务占用80端口

4. sudo /etc/init.d/apache2 restart