I have a question want to ask, I install dual system and virtual machine has encountered a problem, is after entering the Ubuntu interface, ready to install Ubuntu on the desktop, double-click the pop up after the choice of language interface for a few seconds, and then flash back, said pop up in a moment a interface system program problem, I go looking for information, they say open a terminal can Enable changed, but I can't change, change is such, restart or do not have what change, how to do