Just finished installing Ubuntu 14.04. I did a distribution install with LAMP stack. I decided I want to run PHP7, MariaBD and latest Apache2. I have got the PHP7 and MariaDB in place, now I want to change to the latest apache2 using the https://launchpad.net/~ondrej/+archive/ubuntu/apache2 PPA. Before switching this out, do I need to remove the current Apache2 using apt-get remove apache2(etc) ? Or am I able to just add the new PPA and run the apt-get update/upgrade
I suggest starting over with a minimal OS install and adding to that from your choice of repositories.
While cleaning up is possible, you might as well test install from nothing.