我上次删除锁定文件变的更不能用了，出现：The following packages have unmet dependencies:
virtualbox-6.1: Depends: libcurl3 (>= 7.16.2) but it is not installable
Depends: libvpx4 (>= 1.6.0) but it is not installable
Recommends: libsdl-ttf2.0-0 but it is not going to be installed
Recommends: kmod or
kldutils but it is not installable or
module-init-tools but it is not installable
Recommends: linux-headers-generic but it is not installable or
linux-headers-generic-pae but it is not installable or
linux-headers-686-pae but it is not installable or
linux-headers-amd64 but it is not going to be installed or
linux-headers-2.6-686 but it is not installable or
linux-headers-2.6-amd64 but it is not installable or
linux-headers but it is not installable
Recommends: linux-image but it is not installable
Recommends: gcc but it is not going to be installed
Recommends: make or
build-essential but it is not going to be installed or
dpkg-dev but it is not going to be installed
Recommends: binutils but it is not going to be installed
Recommends: pdf-viewer
Linux 命令行的基本操作还是需要你作为用户系统地学习一下的，如果你想好好玩的话。每次遇到问题都靠别人给你解答，基本上是玩不动的。
这里有另外一个状况：如果你是试图在 Linux 子系统里安装 VirtualBox，那就涉及到虚拟机嵌套。即便安装成功，在虚拟机里运行虚拟机的实际性能会非常差，也有极大可能会遇到各种问题，请知悉。