VitrualBox官网：https://www.virtualbox.org/
在线用户手册：https://www.virtualbox.org/manual/
在线安装说明：https://www.virtualbox.org/wiki/Linux_Downloads
本文安装步骤参考VitrualBox官网安装说明，软件当前版本为6.1。安装VirtualBox需要用到的命令：sudo, wget, apt-key, apt-get。若是root用户登陆进行安装，去掉命令行中的sudo命令。
第一步：添加virtualbox deb源：
deb [arch=amd64] https://download.virtualbox.org/virtualbox/debian buster contrib
markul@server:~# sudo vi /etc/apt/sources.list
markul@server:~# sudo cat /etc/apt/sources.list
deb http://mirrors.163.com/debian/ buster main non-free contrib
deb http://security.debian.org/debian-security buster/updates main contrib non-free
deb http://mirrors.163.com/debian/ buster-updates main contrib non-free
deb-src http://mirrors.163.com/debian/ buster main non-free contrib
deb-src http://security.debian.org/debian-security buster/updates main contrib non-free
deb-src http://mirrors.163.com/debian/ buster-updates main contrib non-free
deb [arch=amd64] https://download.virtualbox.org/virtualbox/debian buster contrib
第二步：下载和添加 Oracle的apt-secure公钥文件:
markul@server:~# wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | sudo apt-key add -
markul@server:~# wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add -
第三步：安装virtualbox6.1版本：
#更新源
markul@server:~# sudo apt-get update
#安装virtualbox-6.1版本
markul@server:~# sudo apt-get install virtualbox-6.1
#查看已经安装的virtualbox版本号
markul@server:~# sudo VBoxManage -v
6.1.4r136177