Vagrant with Ubuntu Focal (20.04)

Jul 28, 2020 11:49 · 601 words · 3 minute read ubuntu vagrant virtualbox

Vagrant is a great way to script development environments for system administrators. It works with full virtualization and is closer to the real hardware than container systems.

There is a bug in the latest version of Ubuntu (Vagrant Box) that makes it hang during boot. It even hangs the VirtualBox and makes the GUI misbehave. The reason is a missing redirect of the console serial device. Console output fills up a buffer and then just hangs.

This can easily be remedied with adding the missing redirect of the console to a file.


Full output of a Vagrantfile with the workaround. Make a note of the CURENT_PATH. It’s needed to put the redirect file in the current folder of the Vagrantfile.

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

# Find working directory.
CURRENT_PATH = File.dirname(File.expand_path(__FILE__))

# All Vagrant configuration is done below. The "2" in Vagrant.configure
# configures the configuration version (we support older styles for
# backwards compatibility). Please don't change it unless you know what
# you're doing.
Vagrant.configure("2") do |config|
  # The most common configuration options are documented and commented below.
  # For a complete reference, please see the online documentation at

  # Every Vagrant development environment requires a box. You can search for
  # boxes at = "ubuntu/focal64"

  # Disable automatic box update checking. If you disable this, then
  # boxes will only be checked for updates when the user runs
  # `vagrant box outdated`. This is not recommended.
  # config.vm.box_check_update = false

  # Create a forwarded port mapping which allows access to a specific port
  # within the machine from a port on the host machine. In the example below,
  # accessing "localhost:8080" will access port 80 on the guest machine.
  # NOTE: This will enable public access to the opened port
  # "forwarded_port", guest: 80, host: 8080

  # Create a forwarded port mapping which allows access to a specific port
  # within the machine from a port on the host machine and only allow access
  # via to disable public access
  # "forwarded_port", guest: 80, host: 8080, host_ip: ""

  # Create a private network, which allows host-only access to the machine
  # using a specific IP.
  # "private_network", ip: ""

  # Create a public network, which generally matched to bridged network.
  # Bridged networks make the machine appear as another physical device on
  # your network.
  # "public_network"

  # Share an additional folder to the guest VM. The first argument is
  # the path on the host to the actual folder. The second argument is
  # the path on the guest to mount the folder. And the optional third
  # argument is a set of non-required options.
  # config.vm.synced_folder "../data", "/vagrant_data"

  # Provider-specific configuration so you can fine-tune various
  # backing providers for Vagrant. These expose provider-specific options.
  # Example for VirtualBox:
  config.vm.provider "virtualbox" do |vb|
  #   # Display the VirtualBox GUI when booting the machine
  #   vb.gui = true
  #   # Customize the amount of memory on the VM:
  #   vb.memory = "1024"

    # Add missing console output
    vb.customize ["modifyvm", :id, "--uart1", "0x3F8", "4"]
    vb.customize ["modifyvm", :id, "--uartmode1", "file", "#{CURRENT_PATH}/console.out"]
  # View the documentation for the provider you are using for more
  # information on available options.

  # Enable provisioning with a shell script. Additional provisioners such as
  # Ansible, Chef, Docker, Puppet and Salt are also available. Please see the
  # documentation for more information about their specific syntax and use.
  # config.vm.provision "shell", inline: <<-SHELL
  #   apt-get update
  #   apt-get install -y apache2