gistfile1.json

{
  "builders": [{
    "type": "virtualbox",
    "guest_os_type": "Ubuntu_64",
    "iso_url": "http://releases.ubuntu.com/12.04/ubuntu-12.04.2-server-amd64.iso",
    "iso_md5": "af5f788aee1b32c4b2634734309cc9e9",
    "ssh_username": "packer",
    "ssh_wait_timeout": "60s",
    "boot_wait": "30s",
    "boot_command": [
      "<esc><esc><enter><wait>",
      "/install/vmlinuz noapic ",
      "preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/preseed.cfg ",
      "debian-installer=en_US auto locale=en_US kbd-chooser/method=us ",
      "hostname={{ .Name }} ",
      "fb=false debconf/frontend=noninteractive ",
      "keyboard-configuration/modelcode=SKIP keyboard-configuration/layout=USA ",
      "keyboard-configuration/variant=USA console-setup/ask_detect=false ",
      "initrd=/install/initrd.gz -- <enter>"
    ]
  }],
  "post-processors": ["vagrant"]
}