问题：
virtualbox-5.0 : Depends: libvpx1 (>= 1.0.0) but it is not installable
Recommends: libsdl-ttf2.0-0 but it is not going to be installed
解决：
1、确认 /etc/apt/sources.list里面有这命令
deb http://download.virtualbox.org/virtualbox/debian vivid contrib
2、运行下列命令：
sudo sed -i 's/vivid/wily/' /etc/apt/sources.list
sudo apt-get update
sudo apt-get install virtualbox-5.0
原因：
You use the repository for Vivid and the VirtualBox package in this repository depends on libvpx1 which is available for Vivid but not for Wily.
如何安装virtualBox-5.0
1、添加 一下命令到 /etc/apt/sources.list
deb http://download.virtualbox.org/virtualbox/debian vivid contrib
2、
wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add -
3、
sudo apt-get update sudo apt-get install virtualbox-5.0