I've been playing with a VM running a Ubuntu hosting a Minecraft server. Everything was working great until today. When my daughter said she could not connect to the server, I opened a VNC session from FN and found it was at the install Ubuntu menu, like when I initially installed it. By default, it times out and runs the 'Try Ubuntu without installing' option. It's no longer booting to my Ubuntu installation on the VM. Is there something I'm missing? What would cause this, and can I recover without reinstalling everything?