Problem doing vagrant up with Kubernetes on my Ubuntu 14.04 machine

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satnam@satnam:~/gocode/src/github.com/GoogleCloudPlatform/kubernetes$ vagrant up
Bringing machine 'master' up with 'virtualbox' provider...
Bringing machine 'minion-1' up with 'virtualbox' provider...
Bringing machine 'minion-2' up with 'virtualbox' provider...
Bringing machine 'minion-3' up with 'virtualbox' provider...
==> master: Box 'fedora20' could not be found. Attempting to find and install...
    master: Box Provider: virtualbox
    master: Box Version: >= 0
==> master: Adding box 'fedora20' (v0) for provider: virtualbox
    master: Downloading: http://opscode-vm-bento.s3.amazonaws.com/vagrant/virtualbox/opscode_fedora-20_chef-provisionerless.box
==> master: Successfully added box 'fedora20' (v0) for 'virtualbox'!
==> master: Importing base box 'fedora20'...
==> master: Matching MAC address for NAT networking...
==> master: Setting the name of the VM: kubernetes_master_1415928118485_94253
==> master: Clearing any previously set network interfaces...
==> master: Preparing network interfaces based on configuration...
    master: Adapter 1: nat
    master: Adapter 2: hostonly
==> master: Forwarding ports...
    master: 22 => 2222 (adapter 1)
==> master: Running 'pre-boot' VM customizations...
==> master: Booting VM...
==> master: Waiting for machine to boot. This may take a few minutes...
The guest machine entered an invalid state while waiting for it
to boot. Valid states are 'starting, running'. The machine is in the
'poweroff' state. Please verify everything is configured
properly and try again.

If the provider you're using has a GUI that comes with it,
it is often helpful to open that and watch the machine, since the
GUI often has more helpful error messages than Vagrant can retrieve.
For example, if you're using VirtualBox, run `vagrant up` while the
VirtualBox GUI is open.