A vagrantfile to upgrade the vbox additions

Vagrantfile

Vagrant.configure(2) do |config|
  config.vm.box = "hashicorp/precise64"
  config.vm.provider "virtualbox" do |v|
    v.memory = 4096
    v.cpus = 2
  end
  config.vm.provision "shell", inline: <<-SHELL
    set -e
    sudo apt-get install -y dkms wget linux-headers-`uname -r`
    wget http://dlc-cdn.sun.com/virtualbox/4.3.28/VBoxGuestAdditions_4.3.28.iso
    md5sum VBoxGuestAdditions_4.3.28.iso | grep ed0796a1ec2cfc75eae20e3b1211ab73
    sha256sum VBoxGuestAdditions_4.3.28.iso | grep 9f52e186d6c9407b2676d4b2ed1cdf96940ec129cc2bd92e54b24526271a9733
    mount -o loop VBoxGuestAdditions_4.3.28.iso /mnt/
    cd /mnt/
    sh VBoxLinuxAdditions.run 2>&1 |grep "Could not find the X.Org or XFree86 Window System, skipping."
  SHELL
end