Fix VBox definition

Vagrantfile-template

-Vagrant.configure("2") do |config|
-  config.vm.provider :virtualbox do |v, override|
-    v.gui = true
-    v.customize ["modifyvm", :id, "--vram", "128"]
-  end
-end

ubuntu.json

@@ -51,21 +51,14 @@
         {
             "boot_command": [
                 "<esc><wait>",
-                "install ",
-                " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/preseed.cfg ",
-                "debian-installer=en_US.UTF-8 ",
-                "auto ",
-                "locale=en_US.UTF-8 ",
-                "kbd-chooser/method=us ",
-                "keyboard-configuration/xkb-keymap=us ",
-                "netcfg/get_hostname=kali ",
-                "netcfg/get_domain=kali ",
-                "fb=false ",
-                "debconf/frontend=noninteractive ",
-                "console-setup/ask_detect=false ",
-                "console-keymaps-at/keymap=us ",
-                "grub-installer/bootdev=/dev/sda",
-                "<enter><wait>"
+                "<esc><wait>",
+                "<enter><wait>",
+                "/install/vmlinuz",
+                " initrd=/install/initrd.gz",
+                " auto=true",
+                " priority=critical",
+                " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/preseed.cfg",
+                " --<enter>"
             ],
             "boot_wait": "{{user `boot_wait`}}",
             "disk_size": "{{ user `disk_size` }}",