SHELL

completely uninstall apache from ubuntu

sudo apt-get remove --purge apache2 apache2-data apache2-utils

completely remove apache in ubuntu

sudo apt remove --purge apache2
sudo apt autoremove -y

Completely uninstall apache2

$sudo service apache2 stop

$ sudo apt-get purge apache2 apache2-utils apache2.2-bin apache2-common
$ sudo apt-get autoremove

$ whereis apache2