Server 2016 reverse dns not updating
App Armor is a security extension (similar to SELinux) that should provide extended security.In my opinion, you don't need it to configure a secure system, and it usually causes more problems than advantages (think of it after you have done a week of trouble-shooting because some service wasn't working as expected, and then you find out that everything was ok, only App Armor was causing the problem).
The resulting system will provide a Web, Mail, Mailinglist, DNS and FTP Server.
Therefore, I disable it (this is a must if you want to install ISPConfig later on).
Before proceeding further you need to have a basic minimal installation of Ubuntu 16.04 as explained in the tutorial.
Edit ## deb cdrom:[Ubuntu-Server 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420)]/ xenial main restricted#deb cdrom:[Ubuntu-Server 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420)]/ xenial main restricted# See Notes for how to upgrade to# newer versions of the xenial main restricted# deb-src xenial main restricted## Major bug fix updates produced after the final release of the## xenial-updates main restricted# deb-src xenial-updates main restricted## N. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu## team, and may not be under a free licence.
Notice: The ISPConfig 3.1 version that is used in this tutorial is currently in beta state.The ISPConfig old stable 3.0.5p9 version can not be used on Ubuntu 16.04 as it is not compatible with PHP 7. These settings might differ for you, so you have to replace them where appropriate.