Get official ubuntu box

* Is not needed to set url box, we can get directly box from https://atlas.hashicorp.com/ubuntu

Vagrantfile

@@ -1,7 +1,6 @@
 Vagrant.configure("2") do |config|
 
-  config.vm.box = "precise64"
-  config.vm.box_url = "http://files.vagrantup.com/precise64.box"
+  config.vm.box = "ubuntu/precise64"
 
   config.vm.network :private_network, ip: "10.10.10.10"
   config.ssh.forward_agent = true
@@ -14,4 +13,4 @@ Vagrant.configure("2") do |config|
 
   config.vm.provision :shell, :path => "server_config/server_install.sh"
 
-end
+end