Upgrading Apache HTTP Server 2.2 to 2.4 on Ubuntu 12.04
https://www.ivankrizsan.se/2014/07/17/upgrading-apache-http-server-2-2-to-2-4-on-ubuntu-12-04/ service apache2 stop rm -r /etc/apache2/ apt-get remove apache2 apt-get remove apache2* apt-get purge apache2 apache2-utils apache2.2-bin apache2-common apt-get autoremove add-apt-repository ppa:ondrej/apach2 apt-get update apt-get upgrade apt-get install apache2