systemctl启动apache2.service
收到此错误：
apache2.service的作业失败，因为控制进程退出并显示错误代码。有关详细信息，请参见“ systemctl status apache2.service”和“ journalctl -xe”。
systemctl状态apache2.service的日志
● apache2.service - The Apache HTTP Server
Loaded: loaded (/lib/systemd/system/apache2.service; disabled; vendor preset: enabled)
Drop-In: /lib/systemd/system/apache2.service.d
└─apache2-systemd.conf
Active: failed (Result: exit-code) since Tue 2020-06-02 08:24:55 IST; 49s ago
Process: 9759 ExecStart=/usr/sbin/apachectl start (code=exited, status=127)
Jun 02 08:24:55 GS-4996 systemd[1]: Starting The Apache HTTP Server...
Jun 02 08:24:55 GS-4996 apachectl[9759]: /usr/sbin/apachectl: 174: /usr/sbin/apachectl: /usr/sbin/apache2: not found
Jun 02 08:24:55 GS-4996 apachectl[9759]: Action 'start' failed.
Jun 02 08:24:55 GS-4996 apachectl[9759]: The Apache error log may have more information.
Jun 02 08:24:55 GS-4996 systemd[1]: apache2.service: Control process exited, code=exited status=127
Jun 02 08:24:55 GS-4996 systemd[1]: apache2.service: Failed with result 'exit-code'.
Jun 02 08:24:55 GS-4996 systemd[1]: Failed to start The Apache HTTP Server.
看起来apache2文件在服务器上不可用。/ usr / sbin / apache2由apache2-bin提供。apache2-bin是apache2软件包的依赖项，因此如果没有apache2软件包，apache2将无法正常工作。打开终端并输入：
sudo apt install --reinstall apache2-bin
sudo service apache2 start
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