This is an invitation to please check out our beta version for ejabberd 18.0x on Ubuntu 18.04 [bionic beaver] over on the testing branch.
If you happen to have the time and have a perfect backup so that you can always revert, please upgrade to Ubuntu 18.04 first with do-release-upgrade -d and confirm with lsb_release -a that you're indeed on 18.04. At that point:
git clone https://github.com/openspace42/aenigma -b testing
bash aenigma/setup -b
You will notice some errors, namely with EasyEngine, which doesn't support 18.04 yet, but the underlying nginx will keep working as usual.
Thanks for your help!
Also included with v0.47 are a few bugfixes for the recent change in name of Debian-First-Boot-Setup.
Happy chatting with aenigma!
Nk