{
  "builders": [
    {
      "add_force": true,
      "communicator": "ssh",
      "source_path": "ubuntu/trusty64",
      "type": "vagrant"
    }
  ],
  "provisioners": [
    {
      "inline": [
        "sudo apt-get update",
        "sudo apt-get upgrade -y"
      ],
      "type": "shell"
    },
    // install what you need here
    {
      "inline": [
        "sudo apt-get autoremove -y",
        "sudo apt-get clean"
      ],
      "type": "shell"
    }
  ]
}