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Sometimes it happens that vagrant hangs during boot of your virtual image. Right after typing:
``bash
$ vagrant up
`
It hangs for a long time and then finally throws:
`bash
[default] Failed to connect to VM!
Failed to connect to VM via SSH. Please verify the VM successfully booted
by looking at the VirtualBox GUI.
``
If you open VirtualBox you'll see that the virtual machine preview shows a black
screen with kernels to choose from. This is GRUB requiring user input to boot further.
Here's how to fix that.