Removendo o Apache
$ sudo service apache2 stop
$ sudo apt-get purge apache2 apache2-utils apache2.2-bin apache2-common
$ sudo apt remove apache2.*
$ sudo apt-get autoremove
$ whereis apache2
$ sudo rm -rf /etc/apache2
Removendo o PHP
$ sudo apt-get purge `dpkg -l | grep php7.2| awk '{print $2}' |tr "\n" " "`
$ sudo apt-get purge php7.*
$ sudo apt-get autoremove --purge
$ whereis php
$ sudo rm -rf /etc/php
Removendo o MySQL
$ sudo service mysql stop
$ sudo apt-get remove --purge *mysql\*
$ sudo apt-get remove --purge mysql-server mysql-client mysql-common -y
$ rm -rf /etc/mysql
$ sudo apt-get autoremove
$ sudo apt-get autoclean
Para finalizar
$ sudo reboot
Social