Install, Uninstall, Remove and reinstall apache2

To see which is installed:

dpkg -l | grep apache

To install apache2 on ubuntu:

sudo apt-get install apache2 apache2.2-common

To remove

sudo apt-get remove apache2 apache2.2-common --purge

apt-get -o DPkg::Options::="--force-confmiss" --reinstall install apache2.2-common