Mac上VirtualBox中安装ubuntu虚拟机分辨率问题

参考这两个帖子：
http://askubuntu.com/questions/240745/how-do-i-get-a-larger-screen-resolution-in-virtualbox-on-mac-os-x
http://askubuntu.com/questions/573596/unable-to-install-guest-additions-cd-image-on-virtual-box

sudo apt-get update
sudo apt-get upgrade
sudo apt-get install dkms
sudo apt-get install build-essential

sudo apt-get install virtualbox-guest-utils

重启虚拟机，问题解决。