installation of pr2 simulator

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Hi, I'm new to ROS. I'm following the tutorial:

http://www.ros.org/wiki/pr2_simulator/Tutorials/StartingPR2Simulation

when I do:

rosmake pr2_gazebo

I get the following error:

rosmake ] Packages requested are: ['pr2_gazebo']
[ rosmake ] Logging to directory/home/randaz/.ros/rosmake/rosmake_output-20111110-144213 [ rosmake ] Expanded args ['pr2_gazebo'] to: []
[ rosmake ] WARNING: The following args could not be parsed as stacks or packages: ['pr2_gazebo'] [ rosmake ] ERROR: No arguments could be parsed into valid package or stack names.

I also cannot do:

roslaunch pr2_gazebo pr2.launch [pr2_gazebo] is not a package or launch file name

I don't know if something is missing in my installation. I installed:

sudo apt-get install ros-electric-desktop-full

and

sudo apt-get install ros-electric-wg-pr2-apps

Do I need something else? I'm using Ubuntu 11.10 Oneiric

Thank you