我部署了Google Cloud Compute Engine小实例。但是我想在该实例上运行一个Apache2 Web服务器。当它由apt-get安装程序安装时，最后说：
invoke-rc.d: could not determine current runlevel
invoke-rc.d：policy-rc.d拒绝执行启动。 处理libc-bin（2.24-11 + deb9u3）的触发器..
启动服务时说，
Starting Apache httpd web server: apache2AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 172.17.0.2. Set the 'ServerName' directive globally to suppress this message
(98)Address already in use: AH00072: make_sock: could not bind to address [::]:80
(98)Address already in use: AH00072: make_sock: could not bind to address 0.0.0.0:80
no listening sockets available, shutting down
AH00015: Unable to open logs
Action 'start' failed.
The Apache error log may have more information.
我允许使用HTTP和HTTPS防火墙规则
那里缺少什么？请帮忙。