Vagrantfile: add focal

Vagrantfile

@@ -2,6 +2,7 @@
 # vi: set ft=ruby :
 
 # Testing an ArduPilot VM:
+# dpkg -l | grep modemmanager
 # sim_vehicle.py --map --console # in the starting directory should start a Copter simulation
 # sim_vehicle.py --debug --gdb
 # sim_vehicle.py --valgrind
@@ -137,15 +138,34 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
     end
   end
 
-  # 19.04 bleeding edge
+  # 19.04
   config.vm.define "disco64", autostart: false do |disco64|
     disco64.vm.box = "ubuntu/disco64"
     disco64.vm.provision :shell, path: "Tools/vagrant/initvagrant.sh"
     disco64.vm.provider "virtualbox" do |vb|
       vb.name = "ArduPilot (disco64)"
-      vb.gui = true
     end
   end
 
+  # 19.10 - broken; fails to use NamedTemporaryFile to create file for gdb
+#  config.vm.define "eoan", autostart: false do |eoan|
+#    eoan.vm.box = "ubuntu/eoan64"
+#    eoan.vm.provision :shell, path: "Tools/vagrant/initvagrant.sh"
+#    eoan.vm.provider "virtualbox" do |vb|
+#      vb.name = "ArduPilot (eoan)"
+#    end
+#    eoan.vm.boot_timeout = 1200
+#  end
+
+  # 20.04 LTS
+  config.vm.define "focal", autostart: false do |focal|
+    focal.vm.box = "ubuntu/focal64"
+    focal.vm.provision :shell, path: "Tools/vagrant/initvagrant.sh"
+    focal.vm.provider "virtualbox" do |vb|
+      vb.name = "ArduPilot (focal)"
+    end
+    focal.vm.boot_timeout = 1200
+  end
+
 end