I have received the same error on VMWare 12 when trying to start the Sandbox. The specific error message says: "Failed to start LSB: Bring up/down networking. See 'systemctl status network.service' for details". It sits at the screen for a while "Waiting for ambari services to start" and then the screen goes blank and it never seems to finish coming up. I am unable to connect via the browser, nor can I connect via Remote Desktop.