Update local.yml

Disable ubuntu.yml for now since it's not implemented.

local.yml

@@ -6,8 +6,8 @@
     - name: Configure Mac
       include_tasks: osx.yml
       when: "ansible_os_family == 'Darwin'"
-    - name: Configure Ubuntu
-      include_tasks: ubuntu.yml
-      when: "ansible_distribution == 'Ubuntu'"
+#    - name: Configure Ubuntu
+#      include_tasks: ubuntu.yml
+#      when: "ansible_distribution == 'Ubuntu'"
     - name: Do generic tasks
       include_tasks: generic.yml