Homestead 死活安装不了，卡在 Homestead-7: SSH auth method: private key？

==> homestead-7: Waiting for machine to boot. This may take a few minutes...
    homestead-7: SSH address: 127.0.0.1:2222
    homestead-7: SSH username: vagrant
    homestead-7: SSH auth method: private key
    Timed out while waiting for the machine to boot. This means that
    Vagrant was unable to communicate with the guest machine within
    the configured ("config.vm.boot_timeout" value) time period.

    If you look above, you should be able to see the error(s) that
    Vagrant had when attempting to connect to the machine. These errors
    are usually good hints as to what may be wrong.

    If you're using a custom box, make sure that networking is properly
    working and you're able to connect to the machine. It is a common
    problem that networking isn't setup properly in these boxes.
    Verify that authentication configurations are also setup properly,
    as well.

    If the box appears to be booting properly, you may want to increase
    the timeout ("config.vm.boot_timeout") value.

用的PC安装到这没法继续了，教程里面的FAQ 全部试过都不行。vtrualbox，vagrant 都运行正常。
出师未捷，难道要买Mac？一下午搞这个，现在整个人头昏脑涨，烦躁得不得了。
祈祷有大神拯救。:sob: :sob: :sob: :sob: :sob: