Ubuntu Server 20.04 Focal with Desktop packages and development tools

Vagrantfile

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

# Ubuntu Server with GNOME3 desktop and development tools

Vagrant.configure("2") do |config|
  config.vm.box = "ubuntu/focal64"
  config.vm.box_check_update = false
  config.vm.hostname = "ufvm2"

  # config.vm.network :hostonly, type: "dhcp", :netmask => "255.255.255.0"
  # config.vm.network "private_network", type: "dhcp", name: "vboxnet1"
  # config.vm.network "private_network", name:'vboxnet0', adapter: 2, auto_config: false
  # config.vm.network "private_network", :type => 'dhcp', :name => 'vboxnet0', :adapter => 2

  config.vm.synced_folder ".", "/home/khassanov/Host", disabled: false,
    owner: "khassanov", group: "khassanov"

  config.vm.provider "virtualbox" do |vb|
    vb.name = "Ubuntu Focal VM2"
    vb.gui = true
    vb.memory = "2048"
    vb.cpus = 2
    vb.customize ["modifyvm", :id, "--vram", "128"]
  end

  config.vm.provision "shell", inline: <<-SHELL
    # ---
    # Ubuntu Desktop

    sudo apt-get update && sudo apt-get upgrade -y
    sudo apt-get install -y --no-install-recommends ubuntu-desktop
    sudo DEBIAN_FRONTEND=noninteractive apt-get install -yq --no-install-recommends gdm3
    sudo bash -c "echo '/usr/sbin/gdm3' > /etc/X11/default-display-manage"
    sudo DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true dpkg-reconfigure gdm3
    sudo bash -c "echo set shared/default-x-display-manager gdm3 | debconf-communicate"
    sudo usermod -a -G sudo vagrant

    # Ubuntu fonts
    sudo apt-get install -y ttf-ubuntu-font-family

    # VirtualBox guest extensions
    sudo apt-get install -y --no-install-recommends virtualbox-guest-dkms virtualbox-guest-utils virtualbox-guest-x11

    # Network management
    sudo apt-get install -y network-manager network-manager-gnome

    # ---
    # Tools

    sudo apt-get install -y build-essential

    # NodeJS
    curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.35.3/install.sh | bash

    # Rust
    curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y

  SHELL
end
```