Prepare VirtualBox VM (+Vagrant) with WordPress preinstalled

packer.json

{
    "_comment": "Build with `packer build ubuntu.json`",
    "builders": [
        {
            "boot_command": [
                "{{ user `boot_command_prefix` }}",
                "/install/vmlinuz noapic ",
                "initrd=/install/initrd.gz ",
                "file=/floppy/{{ user `preseed` }} ",
                "debian-installer={{ user `locale` }} auto locale={{ user `locale` }} kbd-chooser/method=us ",
                "hostname={{ user `hostname` }} ",
                "grub-installer/bootdev=/dev/sda<wait> ",
                "fb=false debconf/frontend=noninteractive ",
                "keyboard-configuration/modelcode=SKIP keyboard-configuration/layout=USA ",
                "keyboard-configuration/variant=USA console-setup/ask_detect=false ",
                "passwd/user-fullname={{ user `ssh_fullname` }} ",
                "passwd/user-password={{ user `ssh_password` }} ",
                "passwd/user-password-again={{ user `ssh_password` }} ",
                "passwd/username={{ user `ssh_username` }} ",
                "-- <enter>"
            ],
            "disk_size": "{{ user `disk_size` }}",
            "floppy_files": [
                "{{ user `preseed` }}"
            ],
            "guest_additions_path": "VBoxGuestAdditions_{{.Version}}.iso",
            "guest_os_type": "{{ user `virtualbox_guest_os_type` }}",
            "hard_drive_interface": "sata",
            "headless": "{{ user `headless` }}",
            "iso_checksum": "{{ user `iso_checksum` }}",
            "iso_checksum_type": "{{ user `iso_checksum_type` }}",
            "iso_urls": [
                "{{ user `iso_path` }}/{{ user `iso_name` }}",
                "{{ user `iso_url` }}"
            ],
            "output_directory": "output-{{ user `vm_name` }}-virtualbox-iso",
            "post_shutdown_delay": "1m",
            "shutdown_command": "echo '{{ user `ssh_password` }}' | sudo -S shutdown -P now",
            "ssh_password": "{{ user `ssh_password` }}",
            "ssh_username": "{{ user `ssh_username` }}",
            "ssh_wait_timeout": "10000s",
            "type": "virtualbox-iso",
            "vboxmanage": [
                [
                    "modifyvm",
                    "{{.Name}}",
                    "--nictype1",
                    "virtio"
                ],
                [
                    "modifyvm",
                    "{{.Name}}",
                    "--memory",
                    "{{ user `memory` }}"
                ],
                [
                    "modifyvm",
                    "{{.Name}}",
                    "--cpus",
                    "{{ user `cpus` }}"
                ]
            ],
            "virtualbox_version_file": ".vbox_version",
            "vm_name": "{{user `vm_name`}}"
        }
    ],
    "post-processors": [
        {
            "keep_input_artifact": true,
            "output": "box/{{.Provider}}/{{user `vm_name`}}-{{user `version`}}.box",
            "type": "vagrant",
            "vagrantfile_template": "{{ user `vagrantfile_template` }}"
        }
    ],
    "provisioners": [
        {
            "environment_vars": [
                "CLEANUP_PAUSE={{user `cleanup_pause`}}",
                "DESKTOP={{user `desktop`}}",
                "UPDATE={{user `update`}}",
                "INSTALL_VAGRANT_KEY={{user `install_vagrant_key`}}",
                "SSH_USERNAME={{user `ssh_username`}}",
                "SSH_PASSWORD={{user `ssh_password`}}",
                "DBPASSWORD_ADMIN={{user `database_root_password`}}",
                "WORDPRESS_DB_USERNAME={{user `wordpress_database_user`}}",
                "WORDPRESS_DB_PASSWORD={{user `wordpress_database_password`}}",
                "WORDPRESS_DB_NAME={{user `wordpress_database_name`}}",
                "WORDPRESS_SITE_NAME={{user `wordpress_title`}}",
                "WORDPRESS_ADMIN_EMAIL={{user `wordpress_admin_email`}}",
                "WORDPRESS_ADMIN_PASSWORD={{user `wordpress_admin_password`}}",
                "WORDPRESS_ADMIN_USER={{user `wordpress_admin_name`}}",
                "WORDPRESS_PLUGINS={{user `wordpress_plugins`}}",
                "http_proxy={{user `http_proxy`}}",
                "https_proxy={{user `https_proxy`}}",
                "ftp_proxy={{user `ftp_proxy`}}",
                "rsync_proxy={{user `rsync_proxy`}}",
                "no_proxy={{user `no_proxy`}}"
            ],
            "type": "shell",
            "scripts": [
                "./scripts/01_update.sh",
                "./scripts/02_install_php.sh",
                "./scripts/03_vagrant.sh",
                "./scripts/04_virtualbox.sh",
                "./scripts/05_mariadb.sh",
                "./scripts/06_wordpress.sh"
            ],
            "execute_command": "echo '{{ user `ssh_password` }}' | {{.Vars}} sudo -E -S bash '{{.Path}}'"
        }
    ],
    "variables": {
        "boot_command_prefix": "<enter><wait><f6><esc><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs><bs>",
        "cleanup_pause": "",
        "cpus": "1",
        "custom_script": "custom-script.sh",
        "desktop": "false",
        "disk_size": "65536",
        "ftp_proxy": "{{env `ftp_proxy`}}",
        "headless": "true",
        "http_proxy": "{{env `http_proxy`}}",
        "https_proxy": "{{env `https_proxy`}}",
        "install_vagrant_key": "true",
        "iso_checksum": "70db69379816b91eb01559212ae474a36ecec9ef",
        "iso_checksum_type": "sha1",
        "iso_name": "ubuntu-16.04-server-amd64.iso",
        "iso_path": "/Volumes/Storage/software/ubuntu",
        "iso_url": "http://releases.ubuntu.com/16.04/ubuntu-16.04-server-amd64.iso",
        "locale": "en_US",
        "memory": "512",
        "no_proxy": "{{env `no_proxy`}}",
        "preseed": "preseed.cfg",
        "rsync_proxy": "{{env `rsync_proxy`}}",
        "hostname": "vagrant",
        "ssh_fullname": "vagrant",
        "ssh_password": "vagrant",
        "ssh_username": "vagrant",
        "database_root_password": "t00r",
        "wordpress_database_user": "wordpress",
        "wordpress_database_password": "sserpdrow",
        "wordpress_database_name": "wordpress_db",
        "wordpress_title": "Hello",
        "wordpress_admin_name": "Admin",
        "wordpress_admin_email": "mhaligowski@gmail.com",
        "wordpress_admin_password": "q1w2e3r4",
        "wordpress_plugins": "",
        "update": "false",
        "vagrantfile_template": "",
        "version": "0.1.0",
        "virtualbox_guest_os_type": "Ubuntu_64",
        "vm_name": "ubuntu1604",
        "vmware_guest_os_type": "ubuntu-64"
    }
}

preseed.cfg

# Ubuntu preseed file - preseed.cfg
# Works for Ubuntu 10.x, 11.x & 12.x
#
# For more information on preseed syntax and commands, refer to:
# https://help.ubuntu.com/12.04/installation-guide/i386/appendix-preseed.html
#
# For testing, you can fire up a local http server temporary.
# Download the preseed.cfg file locally, cd to the directory where the
# preseed.cfg resides and run hte following command:
#  $ python -m SimpleHTTPServer
# You don't have to restart the server every time you make changes.  Python
# will reload the file from disk every time there is a request.  As long as you
# save your changes they will be reflected in the next HTTP download.  Then to
# test with a PXE boot server, use the following kernel boot parameters:
#  > linux auto url=http://<your_ip>:8000/preseed.cfg hostname=<hostname> locale=en_US keyboard-configuration/modelcode=SKIP
#
# NOTE: If you netboot/PXE boot Ubuntu, it will ignore the value in hostname,
# but you must provide a hostname as a boot parameter to prevent the Ubuntu
# install from prompting for a hostname

choose-mirror-bin mirror/http/proxy string
d-i base-installer/kernel/override-image string linux-server
d-i clock-setup/utc boolean true
d-i clock-setup/utc-auto boolean true
d-i finish-install/reboot_in_progress note
d-i grub-installer/only_debian boolean true
d-i grub-installer/with_other_os boolean true
d-i partman-auto-lvm/guided_size string max
d-i partman-auto/choose_recipe select atomic
d-i partman-auto/method string lvm
d-i partman-lvm/confirm boolean true
d-i partman-lvm/confirm_nooverwrite boolean true
d-i partman-lvm/device_remove_lvm boolean true
d-i partman/choose_partition select finish
d-i partman/confirm boolean true
d-i partman/confirm_nooverwrite boolean true
d-i partman/confirm_write_new_label boolean true
d-i user-setup/allow-password-weak boolean true
d-i user-setup/encrypt-home boolean false

#d-i pkgsel/include string openssh-server cryptsetup build-essential libssl-dev libreadline-dev zlib1g-dev linux-source dkms
d-i pkgsel/include string openssh-server ntp curl nfs-common linux-headers-$(uname -r) build-essential perl dkms
d-i pkgsel/install-language-support boolean false
# Policy for applying updates.  May be "none" (no automatic updates),
# "unattended-upgrades" (install security updates automatically), or
# "landscape" (manage system with Landscape).
d-i pkgsel/update-policy select none
d-i pkgsel/upgrade select full-upgrade
d-i time/zone string UTC
tasksel tasksel/first multiselect standard, server