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Building out a dedicated section to this.
Uninstall Apache completely
1. stop apache:
sudo service apache2 stop
sudo /etc/init.d/apache2 stop
2. remove:
sudo apt-get remove apache2
sudo apt-get purge apache2
References
http://cloudservers.mosso.com/index.php/Ubuntu_-_Apache_configuration#Security_Settings - Rackspace wiki on hardening Apache Web Server.