I am running Ubuntu 12.04 64-bit as a guest on a Windows 7 Sony Vaio laptop (64-bit). Here is what happens:
I start up Ubuntu via the VirtualBox manager (by clicking start)- it runs in scale mode to start out (windowed mode). In this scale mode, I have two options to close Ubuntu:
1)Click the "X" in the upper right-hand corner of the Ubuntu window and just close it like a normal window. A menu pops up with 3 options: a)Save the machine state; b)Send the shutdown signal; and c)Power off the machine.
If I choose option 'c', the window just closes and Ubuntu is no more- I am back in my host Windows 7 environment.
2)The second option I have is by clicking the power symbol while in Ubuntu (which is right below the "X" that closes out the window). When I click "shutdown", I get an error message from Oracle VM VirtualBox Manager: "Orcale VM VirtualBox Manager has stopped working."
It searches for a solution, but does not find one, and the only option I have is to "close program."
So why does closing Ubuntu by "sending the shutdown signal" crash VirtualBox but if I simply close the Ubuntu window by "x"ing out of it, and click "power down machine," I have no problems?
P.S. I can also post the VBox log if that will help ID the root of this problem.