Muximux hangs forever

Hi, 

I have setup muximux using this guide: 
(refer to 10.1 for muximux setup)

https://thisisforsomething.com/guide/guide-to-plex-media-server-on-ubuntu-server-16-04/#doc-muximux-28

And the result is muximux hangs on this screen forever:
https://imgur.com/a/mO06qMb

Please assist thanks 