@_rogue: Apologies for not replying sooner. It worked in my case using a fresh install of the Ubuntu 16.04 server image though. Did you make any changes to your system to remove support for @reboot in cron?
Interesting. Actually come to think now I’m actually using the mini ISO to install this particular system. I wonder if that is the issue. I will snapshot and reinstall the CN with the full server image and see how it goes. But overall I just followed the Ubuntu install instructions to add the repo.