Comment 3 for bug 1800619

Hi,
your service starts to fail after install as it shows in the log.
Unfortunately there isn't much more in the logs attached here to debate what the reason might be.

The log tells you to check out:
  systemctl status rabbitmq-server.service
  journalctl -xe
For more details, and I'd do so as well.

I just installed rabbitmq-server on a fresh xenial system - it works out of the box without tweaking.
Therefore something in your system config is the reasons it fails and we would have to find what exactly.

Once that config issue is resolved it will work to install/update - but the info provided isn't enough to debug it further atm.