I am using the latest MineOS installer .iso, downloaded today (April 16 2020). I am installing it using Virtualbox, I don’t think that is the issue since it works when I create the server using root. But just for the same of knowing as much about my install as possible.
Using the “mc” user I can use the WebUI to create a server and start it. The server starts and after a few seconds it stops itself with no explanation and no log files created. Sometimes it gets as far as asking about the EULA, sometimes not.
If I login to the WebUI using “root” everything works, I had it running long enough to login and play a half hour so far.