我解决了这个问题，如果其他人有类似的问题，我会回答。

我所做的是:我启用了虚拟框的GUI，让它在启动时等待输入，以选择我是想直接引导到ubuntu还是safemode等等。

要打开GUI，你必须把这个放在你的Vagrantfile配置中:

config.vm.provider :virtualbox do |vb|
  vb.gui = true
end

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

这是流浪者的新“特征”。看看这里: https://github.com/mitchellh/vagrant/issues/3329

他们将把“错误”改为“警告”。它只是告诉你机器还没有启动，它正在尝试连接…

我也有同样的问题。我认为问题可能是SSH密钥(错误的文件定位或其他东西，但我检查了很多次)，但你可能总是在配置部分添加用户名和密码(不使用SSH密钥)和运行gui，所以Vagrantfile中的代码应该看起来或多或少如下:

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|

  config.ssh.username = "vagrant"
  config.ssh.password = "vagrant"

   config.vm.provider "virtualbox" do |vb|
     vb.gui = true
   end
end

In my case even if GUI was displayed I got black screen (no errors or possibility to login or anything else) and in console I got the Error: Connection timeout. Retrying... many times. I made sure I had VT-x (virtualization) enabled in BIOS, I checked many combinations of versions of both Virtual Box and Vagrant together and many Vagrant boxes (for some of them I didn't have black screen in GUI but still have connection problems). Finally I've updated VirtualBox and Vagrant again to the last versions and the problem still occurred.

最关键的是在运行vagrantup(使用Vagrantfile中的GUI)后，在VirtualBox中查看图标，如下图所示

虽然我在VirtualPC中没有错误(没有VT-x未启用的警告)，但我的V图标是灰色的，所以这意味着VT-x被禁用。正如我说的，我一直在我的BIOS中启用它。

Finally I realized the problem might by HYPER-V which I also installed and enabled to test sites on older Internet Explorer. I went to Windows Control Panel -> Programs and functions / Software and choose from the menu on left Turn on or Turn off Windows functions (hope you will find those, I use Polish Windows so don't know exact English names). I turned off Hyper-V, restarted PC and after running Virtual Box and vagrant up I finally had no errors, in GUI I have login screen and my V icon stopped to be gray.

我浪费了很多时间来解决这个问题(和许多电脑重启)，所以我希望这可能对任何在Windows上有问题的人有帮助-确保你在控制面板中关闭了Hyper-V。

SSH连接在初始启动时超时可能与多种原因有关，例如:

check whether virtualization is enabled in BIOS (as per comment), system awaits for user interaction (e.g. share partition is not ready), mismatch of your private key (check the config via vagrant ssh-config), the booting process takes much longer time (try increasing config.vm.boot_timeout), it's booting from the wrong drive (e.g. from the installer ISO), VM firewall misconfiguration (e.g. iptables configuration), local firewall rules, port conflict or conflict with a VPN software, sshd misconfiguration.

要调试问题，请运行——debug选项或如下:

VAGRANT_LOG=debug vagrant up

如果没有什么明显的，那么尝试从另一个终端连接到它，通过vagrant ssh或通过:

vagrant ssh-config > vagrant-ssh; ssh -F vagrant-ssh default

如果SSH仍然失败，尝试使用GUI(例如config. exe)运行它。GUI = true)。

如果不是，检查正在运行的进程(例如:vagrant ssh -c ' pstrree -a')或验证您的sshd_config。

如果它是一次性的虚拟机，你总是可以尝试破坏它，并重新启动它。

你也应该考虑升级你的Vagrant和Virtualbox。

有关详细信息，请检查调试和故障排除页面。

It used to help to switch to trusty32, but the situation now got worse again: I tried to use Homestead 2.0 and now I've got the Connection Timeout problem again, which would't usually be a problem, because switching to 32bit helped before. But now I can't just add a line like config.vm.box="ubuntu/trusty32" because we don't have a classic Homestead.yaml file anymore, the values in the new 2.0 Homestead.yaml file just seem to be inserted into the real one in the background and there ist no Vagrantfile available that I could manually edit ...

希望有人能帮忙……