Suggest removal of the ubuntu theme package

Removing the ubuntu theme pakage is cleaner then changing
the include code and also works.

OpenStack_Folsom_Install_Guide_WebVersion.rst

@@ -492,15 +492,9 @@ Status: stable
    apt-get install openstack-dashboard memcached
 
 
-* If you don't like the OpenStack ubuntu theme, you can disabled it and go back to the default look::
-
-   nano /etc/openstack-dashboard/local_settings.py
-   #Comment these lines
-   #Enable the Ubuntu theme if it is present.
-   #try:
-   #    from ubuntu_theme import *
-   #except ImportError:
-   #    pass
+* If you don't like the OpenStack ubuntu theme, you can remove the package to disable it:
+
+   dpkg --purge openstack-dashboard-ubuntu-theme
 
 * Reload Apache and memcached::