So, I have been struggling with some of the same issues. Here are the things that I had to change in order to get things going.
1. The OS on the VM is a 64bit version. On importation of the virtual machine the Operating system selected was a 32bit Ubuntu. I had to change to a 64bit Unbuntu.
2. Then I go an error that my bios was not set up for virtualization. Using the VirtualBox Documentation. Once I found the right spot in my bios, then the virtual machine started.
Once I go through that the start up screen eventual came up on the VM looking like this.
Once I got to that screen I was able in my browser to go to http://127.0.0.1:10000 and go to the web site. Then I had to figure out the startup password for the site. The documentation is fairly clear at that point.