Hi all, I have just installed Ros ( sudo apt-get install ros-cturtle-ros) I want to follow the tutorial (http://www.ros.org/wiki/ROS/Tutorials). But I can't find the package turtlesim needed for the tutorial : rospack find turtlesim [rospack] warning: trailing slash found in ROS_PACKAGE_PATH [rospack] couldn't find package [turtlesim] Could anyone help me to install this package. Thanks.