I had the same problem when I tryed to setup jibri, from a fresh Ubuntu 16.04 installation ; for me, the problem came from lightdm service ; it starts xorg, so the jibri-xorg service can t start.
I stopped lightdm : /etc/init.d/lightdm stop
Then I restart all the jibri services :
service jibri-xorg start
service jibri-icewm start
Just tell me if you achieve to make Jibri work, from jitsi web interface, I don’t have the record icon yet ...