@notaspy If you force this system to fail, then boot the fog server up.
Run the following commands.ps aux | grep dhcp this should show you if the dhcp server is running in memory. netstat -an| grep 67 this should show you that the dhcp server is listening on its data port. You should see something like this udp 0 0 0.0.0.0:67 0.0.0.0:*
Lets start with those. That will give us an idea if the dhcp-server is running and / or listening.
Edit: It looks like ubuntu 16.04+ is based on systemd so these commands will be useful. Don’t use them until we can understand what’s going on here.sudo systemctl restart isc-dhcp-server sudo systemctl status isc-dhcp-server sudo systemctl enable isc-dhcp-server