Ubuntu安装VirtualBox的历史版本

1.打开终端。
2.输入：sudo vi /etc/apt/sources.list
3.输入：i（进入编辑模式）
4.将以下内容插入到尾部。
 deb http://download.virtualbox.org/virtualbox/debian natty contrib
 deb http://download.virtualbox.org/virtualbox/debian maverick contrib non-free
 deb http://download.virtualbox.org/virtualbox/debian lucid contrib non-free
 deb http://download.virtualbox.org/virtualbox/debian karmic contrib non-free
 deb http://download.virtualbox.org/virtualbox/debian hardy contrib non-free
 deb http://download.virtualbox.org/virtualbox/debian squeeze contrib non-free
 deb http://download.virtualbox.org/virtualbox/debian lenny contrib non-free
5.按Esc键
6.输入：:wq
7.输入：sudo apt-get update
8.输入：sudo apt-get install virtualbox-4.0
 "virtualbox-4.0"可以用一下内容进行替换：
 virtualbox-3.2 to install VirtualBox 3.2.12
 virtualbox-3.1 to install VirtualBox 3.1.8
 virtualbox-3.0 to install VirtualBox 3.0.14
 virtualbox-2.2 to install VirtualBox 2.2.4
 virtualbox-2.1 to install VirtualBox 2.1.4
 virtualbox-2.0 to install VirtualBox 2.0.12
 virtualbox to install VirtualBox 1.6.6