I did enable network adapter. I'm going to see how it does on Ubuntu with fresh Centos 7 install. Thanks for the response Ward!FYI: We obviously can't test on every possible platform, but we do test on Windows 10 with VirtualBox 5 (has initialize MAC address option) and Mac Sierra with VirtualBox 6 (just click Import and don't change anything). Have you enabled the network adapter for your platform before starting the VM??
I just redownloaded from SF and tested again with no issues. So... I guess the short answer is don't use Ubuntu if you want this to work. Sorry, but I can't fix it.