If you try to run gazebo for the first time, at least in Ubuntu 14.04 with ROS Indigo you'll get the annoying messages:
Warning [gazebo.cc:215] Waited 1seconds for namespaces.
Error [gazebo.cc:220] Waited 11 seconds for namespaces. Giving up.
Error [Node.cc:90] No namespace found
And you won't have a model for the sun and the ground_plane (really OSRF??).
To fix that just download the models and extract them in ~/.gazebo/models
.
That's a 380MB download, approx.
You could also do:
mkdir -p ~/.gazebo
hg clone https://bitbucket.org/osrf/gazebo_models ~/.gazebo/models
But that's gonna be like 750MB as it has the history of the repo.
I ended up on my own README after having the same problem trying to use the Pepper simulation, when I control+C'ed I got the error:
URI doesn't exist[model://robocup09_spl_field/materials/scripts/]