Updated Ubuntu 16 desktop vagrant box for tutorial P4 VM

Change-Id: I4c3028a715d2a91cceaad44685285148f47d556b
diff --git a/tools/dev/p4vm/Vagrantfile b/tools/dev/p4vm/Vagrantfile
index 259e380..cd4c8c3 100644
--- a/tools/dev/p4vm/Vagrantfile
+++ b/tools/dev/p4vm/Vagrantfile
@@ -2,7 +2,7 @@
 
 Vagrant.configure(2) do |config|
   if P4_VM_TYPE == "tutorial"
-    config.vm.box = "fso/xenial64-desktop"
+    config.vm.box = "lasp/ubuntu16.04-desktop"
   else
     config.vm.box = "bento/ubuntu-16.04"
   end