检查CPU在BIOS设置中的虚拟化是否已启用。

如果您正在使用包装层(如Kitchen CI)，并且正在运行32b主机，则必须抢先安装Vagrant盒子。它们的默认提供程序是二进制文件的opscode“家族”。

所以在厨房创建default-ubuntu-1204之前，请确保您使用:

vagrant box add default-ubuntu-1204 http://opscode-vm-bento.s3.amazonaws.com/vagrant/virtualbox/opscode_ubuntu-12.04-i386_chef-provisionerless.box

如果您的主机不支持字大小虚拟化，则使用32b映像

我在使用x64盒子(chef/ubuntu-14.04)时也遇到了同样的问题。

我更改为x32，它工作(hashicorp/precise32)。

在我的情况下，给它一个静态IP地址，简单地解决了问题:

Config.vm.network "private_network"， ip: "192.168.50.50"

My solution turned out to be none of the above exactly. I'm running Ubuntu 14 as guest inside a Windows 7 host. I had been running this vagrant box fine, but I started it up again after not using it for a couple of months, and it kept coming up with the SSH connection timeout. It turned out that somehow the key pair didn't work - so I copied the Vagrant public key into Ubuntu according to the instructions on this page. But that wasn't all. I then discovered that the private key in my base box was different than the private key here. Putting this private key in as the vagrant_private_key file in C:\Users\your-user.vagrant.d\boxes\vagrant-box-name\nnnnnnnn\virtualbox after placing the public key into Ubuntu fixed the problem.

我解决的方法是，在Windows上键入两次“cmd”(或“ctrl+C”)，然后退出连接失败的屏幕。

然后，我可以通过SSH (vagrant SSH)连接，并自己查看错误。

在我的例子中，这是一个输入错误的路径。