参考源：Linux Tips 由于某些主机提供商在重装系统后系统自带apache2，但是我用不到，一直用的nginx。如果不卸载会导致端口冲突等问题。 所以上网查询了下卸载apache2的资料。

Uninstall and Remove Apache2 on Debian 8

We are going to uninstall and remove Apache2 from our Debian system.

First we have to stop any running instance of Apache2, because Apache2 will not be properly removed while it is running.

For stop Apache2 run below command …

service apache2 stop

Now for remove Apache2 and pakchess run below command …

apt-get purge apache2 apache2-utils apache2.2-bin apache2-common

then run below command …

apt-get autoremove

Now finally, check if there is any configuration files or pages belonging to Apache2, which are still not removed…

whereis apache2

example result like below …

apache2: /usr/sbin/apache2 /usr/lib/apache2 /usr/share/apache2 /usr/share/man/man8/apache2.8.gz

Next if directory still exists the remove those manually …

rm -rf /etc/apache2

Done … Great Job …

Some hosting provider installed Apache2 as default webserver so we can use this steps to uninstall Apache2 from our Debian system.