VirtualBox “Unknown Status 0x800706BE” 解决方法

在virtualbox里安装的win7死机后, 强制关闭virtualbox。再次重启出现如下错误：
Failed to open a session for the virtual machine Win7.

Failed to get a console object from the direct session (Unknown Status 0x800706BE).

Result Code: VBOX_E_VM_ERROR (0x80BB0003)
Component: Machine
Interface: IMachine {22781af3-1c96-4126-9edf-67a020e0e858}

解决方法：
卸载virtualbox
sudo apt-get remove virtualbox<version>

再重新安装，启动virtualbox后，win7依然存在，直接启动即可。