I can install ubuntu just fine on vbox 7, but after I start it, it shows the purple screen(before ubuntu installation starts on the host machine) and then shows this error:You must specify a machine to start, using the command line.
Usage: VirtualBoxVM --startvm <name|UUID>Starts the VirtualBox virtual machine with the given name or unique identifier (UUID).
I tried reinstallation and rebooting the iso image but same error is occurring
