Start VirtualBox. The “Oracle VM VirtualBox Manager” window opens.
Create a virtual machine (needs to be done only once): Go to “File” menu and select “import appliance”. Select the downloaded file “VirtualboxAppliance.ova” and click “Next”. A window “Application Settings” appears. The virtual machine is pre-set to use four processor cores of your machine. If you have fewer or more cores, change the number besides “CPU”. Then click “Import”. It will take a few minutes for your computer to build the new virtual machine. When finished, a new virtual machine appears in the left column of the “Oracle VM VirtualBox Manager” window.
To start the virtual machine, select the VM entry in the “Oracle VM VirtualBox Manager” window and click “Start”. A new window opens and your machine starts running.
The Ubuntu virtual machine will boot directly into the main account (no login required; you have superuser status; login ID “user”, password “user”.). Use Filezilla for file transfer to/from your virtual machine
To close the VM, simply close the VM’s window. Select “Save the machine state” from the popup window (for faster re-start of the VM).