ubuntu xenial64 box password?

As mention by user @prometee in this launchpad discussion #1569237, you can find the password in:

~/.vagrant.d/ubuntu-VAGRANTSLASH-xenial64/20161221.0.0/virtualbox/Vagrantfile

or:

~/.vagrant.d/boxes/ubuntu-VAGRANTSLASH-xenial64/20161221.0.0/virtualbox/Vagrantfile

depending on your version of Vagrant. (Note the 20161221.0.0 part of the path will vary depending on when the box was downloaded. Also, there might be more than one in your directory.)

Here is mine (line 8):

# Front load the includes
include_vagrantfile = File.expand_path("../include/_Vagrantfile", __FILE__)
load include_vagrantfile if File.exist?(include_vagrantfile)

Vagrant.configure("2") do |config|
  config.vm.base_mac = "022999D56C03"
  config.ssh.username = "ubuntu"
  config.ssh.password = "fbcd1ed4fe8c83b157dc6e0f"

  config.vm.provider "virtualbox" do |vb|
     vb.customize [ "modifyvm", :id, "--uart1", "0x3F8", "4" ]
     vb.customize [ "modifyvm", :id, "--uartmode1", "file", File.join(Dir.pwd, "ubuntu-xenial-16.04-cloudimg-console.log") ]
  end
end

FYI, user @racb mention in the same discusison that the this bug report having been filed to ubuntu and so far no [...] decision has been made yet about it.

I banged my head against the wall for half a day yesterday until I realised I was running an old version of Virtualbox (5.0.x) and Vagrant (1.8.0)

Updated to VirtualBox 5.1.x and Vagrant 1.8.7 and got better results

Basically the ubuntu/xenial32 and ubuntu/xenial64 images are flawed as they don't come with the vagrant user out of the box.

This is against the Vagrant specifications

I ended up using v0rtex/xenial64 as recommended in this bug report. Not sure why canonical is not fixing this

My vagrant file is as follows

# -*- mode: ruby -*-
# vi: set ft=ruby :

# Vagrantfile API/syntax version. Don't touch unless you know what you're doing!
VAGRANTFILE_API_VERSION = "2"

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|

  config.vm.box = "v0rtex/xenial64"

  config.vm.network :private_network, ip: "10.10.10.10"

  config.ssh.username = 'vagrant'
  config.ssh.password = 'vagrant'

  config.vm.provider :virtualbox do |vb|
     vb.name = "supercool"
     vb.customize ["modifyvm", :id, "--memory", "768"]
     vb.customize ["modifyvm", :id, "--natdnshostresolver1", "on"]
  end

end

If you still want to use the canonical provided images it is possible using the following approach

# -*- mode: ruby -*-
# vi: set ft=ruby :

# Vagrantfile API/syntax version. Don't touch unless you know what you're doing!
VAGRANTFILE_API_VERSION = "2"

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|

  config.vm.box = "ubuntu/xenial64"

  config.vm.network :private_network, ip: "10.10.10.10"

  config.ssh.insert_key = true
  config.ssh.forward_agent = true

  config.vm.provider :virtualbox do |vb|
     vb.name = "supercool"
     vb.customize ["modifyvm", :id, "--memory", "768"]
     vb.customize ["modifyvm", :id, "--natdnshostresolver1", "on"]
  end

end

If you do that the /vagrant folder will be owned by ubuntu:ubuntu instead of vagrant:vagrant. If you have scripts relying on the vagrant user to be there they will break

It has been fixed at last (2018/01/13): https://bugs.launchpad.net/cloud-images/+bug/1569237/comments/111

You may want to run vagrant box update and then vagrant destroy.