Bringing machine 'default' up with 'virtualbox' provider... Your VM has become "inaccessible." Unfortunately, this is a critical error with VirtualBox that Vagrant can not cleanly recover from.

启动虚拟机报错

vagrant up

Bringing machine 'default' up with 'virtualbox' provider...
Your VM has become "inaccessible." Unfortunately, this is a critical error
with VirtualBox that Vagrant can not cleanly recover from. Please open VirtualBox
and clear out your inaccessible virtual machines or find a way to fix
them.

解决方案

baidu了一下解决办法，有篇blog说直接删除vagrant目录下生成的.vagrant隐藏文件即可，该blog下的七八个comments都表示这个方法有效。不过这个方法并没有解决我的问题。

再仔细看了看vagrant无法访问的提示：Please open VirtualBox and clear out your inaccessible virtual machines or find a way to fix them.看到这句话，于是打开virtualbox界面，virtualbox也提示该虚拟机无法启动，是因为C:\Users\denglj\VirtualBox VMs\vagrant_default_1411538218356_15372\vagrant_default_1411538218356_15372.vbox文件不存在。于是进入该文件的目录，发现并没有后缀为.vbox文件，而是多了一个.vbox-tmp的文件。

抱着试试的想法，简单地将该文件后缀中的-tmp去掉，在执行vagrant up命令，成功了

参考：https://blog.csdn.net/u013419759/article/details/79130124