vagrantfile for different ubuntu versions

Vagrantfile

#!/usr/bin/env ruby

Vagrant.configure("2") do |config|

    #### LTS VERSIONS ####

    # 18.04
    config.vm.define "bionic" , primary: true do |bionic|
        bionic.vm.box = "ubuntu/bionic64"
        bionic.vm.box_check_update = true
        config.vm.provider "virtualbox" do |vb|
            vb.memory = "2048"
            vb.cpus = "4"
        end
    end

    # 16.04
    config.vm.define "xenial" , primary: true do |xenial|
        xenial.vm.box = "ubuntu/xenial64"
        xenial.vm.box_check_update = true
        config.vm.provider "virtualbox" do |vb|
            vb.memory = "2048"
            vb.cpus = "4"
        end
    end

    #### SHORT_TERM VERSIONS ####

    # 19.10 future
    config.vm.define "eoan" , primary: true do |eoan|
        eoan.vm.box = "ubuntu/eoan64"
        eoan.vm.box_check_update = true
        config.vm.provider "virtualbox" do |vb|
            vb.memory = "2048"
            vb.cpus = "4"
        end
    end

    # 19.04
    config.vm.define "disco" , primary: true do |disco|
        disco.vm.box = "ubuntu/disco64"
        disco.vm.box_check_update = true
        config.vm.provider "virtualbox" do |vb|
            vb.memory = "2048"
            vb.cpus = "4"
        end
    end

end