headless selenium Unbuntu Vagrantfile and provision script

Vagrantfile:

Vagrant.configure("2") do |config|
  config.vm.box = "bento/ubuntu-16.04"
  config.ssh.forward_agent = true

  config.vm.network "forwarded_port", guest: 4444, host: 4444

  config.vm.provision 'setup', type: 'shell', path: 'headless_selenium_sever_setup.sh'
end

headless_selenium_server_setup.sh:

#!/bin/sh
set -e

if [ -e /.installed ]; then
  echo 'Already installed.'

else
  echo ''
  echo 'INSTALLING'
  echo '----------'

  # Add Google public key to apt
  wget -q -O - "https://dl-ssl.google.com/linux/linux_signing_key.pub" | sudo apt-key add -

  # Add Google to the apt-get source list
  echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" > /etc/apt/sources.list.d/google-chrome.list

  # Update app-get
  apt-get update

  # Install Java, Chrome, Xvfb, and unzip
  add-apt-repository ppa:webupd8team/java -y
  apt-get update -y
  echo "oracle-java8-installer shared/accepted-oracle-license-v1-1 select true" | debconf-set-selections
  apt-get install -y oracle-java8-installer
  apt-get -y install google-chrome-stable xvfb unzip

  # Download and copy the ChromeDriver to /usr/local/bin
  cd /tmp
  wget -N http://chromedriver.storage.googleapis.com/2.29/chromedriver_linux64.zip
  wget http://selenium-release.storage.googleapis.com/3.4/selenium-server-standalone-3.4.0.jar
  unzip chromedriver_linux64.zip
  mv chromedriver /usr/local/bin
  mv selenium-server-standalone-3.4.0.jar /usr/local/bin

  # So that running `vagrant provision` doesn't redownload everything
  touch /.installed
fi

echo Create xvfb startup script
touch /etc/systemd/system/xvfb.service
chmod 644 /etc/systemd/system/xvfb.service
cat <<EOT >> /etc/systemd/system/xvfb.service
[Unit]
Description=Xvfb
After=syslog.target network.target

[Service]
Type=oneshot
RemainAfterExit=yes
User=vagrant
ExecStart=/bin/xvfb.sh
Environment=DISPLAY=:10

[Install]
WantedBy=multi-user.target
EOT
touch /bin/xvfb.sh
chown :vagrant /bin/xvfb.sh
chmod 750 /bin/xvfb.sh
cat <<EOT >> /bin/xvfb.sh
#! /bin/bash

Xvfb :10 -screen 0 1366x768x24 -ac &
EOT

echo Create google-chrome startup script
touch /etc/systemd/system/google-chrome.service
chmod 644 /etc/systemd/system/google-chrome.service
cat <<EOT >> /etc/systemd/system/google-chrome.service
[Unit]
Description=Google Chrome
After=xvfb.service

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/bin/google-chrome.sh
Environment=DISPLAY=:10

[Install]
WantedBy=multi-user.target
EOT
touch /bin/google-chrome.sh
chmod 750 /bin/google-chrome.sh
cat <<EOT >> /bin/google-chrome.sh
#! /bin/bash

google-chrome --remote-debugging-port=92222 &
EOT

echo Create selenium-server startup script
touch /etc/systemd/system/selenium-server.service
chmod 644 /etc/systemd/system/selenium-server.service
cat <<EOT >> /etc/systemd/system/selenium-server.service
[Unit]
Description=Selenium Standalone Server
After=google-chrome

[Service]
Type=oneshot
RemainAfterExit=yes
User=vagrant
ExecStart=/bin/selenium-server.sh

[Install]
WantedBy=multi-user.target
EOT
touch /bin/selenium-server.sh
chown :vagrant /bin/selenium-server.sh
chmod 750 /bin/selenium-server.sh
cat <<EOT >> /bin/selenium-server.sh
#! /bin/bash

export DISPLAY=:10
cd /usr/local/bin
nohup java -jar ./selenium-server-standalone-3.4.0.jar &
EOT

systemctl daemon-reload
systemctl enable xvfb
systemctl enable google-chrome
systemctl enable selenium-server
systemctl start xvfb
systemctl start google-chrome
systemctl start selenium-server