Mac下VirtualBox安装Ubuntu出现问题：
The system is running in low-graphic mode
Your screen, graphics card and input devices settings could not be detected correctly. You will configure these yourself.
同时按住control + alt + F1 进入命令行界面
解决方法：
01.## sudo apt-get update
02.## sudo apt-get install virtualbox-guest-dkms
03.## reboot
开机按住shift键。
作者：Bupt_Tornado
