macOS 10.13 安裝Virtualbox失敗

1，Virtualbox 安裝不成功，vagrant up 就報錯：

There was an error while executing `VBoxManage`, a CLI used by Vagrant
for controlling VirtualBox. The command and stderr is shown below.

Command: ["hostonlyif", "create"]

Stderr: 0%...
Progress state: NS_ERROR_FAILURE
VBoxManage: error: Failed to create the host-only adapter
VBoxManage: error: VBoxNetAdpCtl: Error while adding new interface: failed to open /dev/vboxnetctl: No such file or directory
VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component HostNetworkInterfaceWrap, interface IHostNetworkInterface
VBoxManage: error: Context: "RTEXITCODE handleCreate(HandlerArg *)" at line 71 of file VBoxManageHostonly.cpp

2，進入系統偏好設置-安全性與隱私，看不到“任何來源”選項

3，解決方法：

     進入終端輸入：sudo spctl --master-disable，然后就看到：

重要步驟：需要重新進入以上設置，找到“任何來源”下方出現一行關於“Oracel America,Inc.”說明文字，點擊“允許”按鈕。之后重新安裝虛擬機即可。