1，Virtualbox 安装不成功，vagrant up 就报错：

There was an error while executing `VBoxManage`, a CLI used by Vagrantfor controlling VirtualBox. The command and stderr is shown below.Command: ["hostonlyif", "create"]Stderr: 0%...Progress state: NS_ERROR_FAILUREVBoxManage: error: Failed to create the host-only adapterVBoxManage: error: VBoxNetAdpCtl: Error while adding new interface: failed to open /dev/vboxnetctl: No such file or directoryVBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component HostNetworkInterfaceWrap, interface IHostNetworkInterfaceVBoxManage: error: Context: "RTEXITCODE handleCreate(HandlerArg *)" at line 71 of file VBoxManageHostonly.cpp

2，进入系统偏好设置-安全性与隐私，看不到“任何来源”选项

3，解决方法：

     进入终端输入：sudo spctl --master-disable，然后就看到：

重要步骤：需要重新进入以上设置，找到“任何来源”下方出现一行关于“Oracel America,Inc.”说明文字，点击“允许”按钮。之后重新安装虚拟机即可。