touch /etc/apt/sources.list.d/froxlor.list
echo 'deb http://debian.froxlor.org stable main' > /etc/apt/sources.list.d/froxlor.list
sudo add-apt-repository ppa:ondrej/apache2
sudo add-apt-repository ppa:ondrej/php
sudo apt-get update && sudo apt-get upgrade
sudo apt-get install php5.6 -y
apt-get install maildrop libsasl2-modules-sql dovecot-pop3d proftpd-mod-mysql bind9 -y
# I opted to run proftpd from a service, since I'm not expecting a ton of
# traffic on my platform, per the guidance
I hit a wall with php5 dependencies, and I didn't want to step as far back as Ubuntu 14.04 to explore the availability of the libraries in the OS lists for that distro. I ended up going in the direction of Vesta instead: https://vestacp.com/install/