Perhaps that an issue with bindings? Take a look here http://xibo.org.uk/manual/en/install_environment.html#zeroMQ
Any reason why you didn’t install it in docker environment?
As per http://xibo.org.uk/manual/en/install_docker_linux.html / Xibo 1.8.0 with Docker on Ubuntu 16.04 instructions?
With docker you wouldn’t need to make those manual steps, as it would be configured for you.