問題：
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
解決：
1、确認 /etc/apt/sources.list裡面有這指令
deb http://download.virtualbox.org/virtualbox/debian vivid contrib 2、運作下列指令：
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.
如何安裝virtualBox-5.0
1、添加 一下指令到 /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