Hi, all: Recently, I upgraded boxturtle to cturtle, in Ubuntu 10.04 Lucid. Well, I just removed all the boxturtle packages and installed all the cturtle packages from within Ubuntu 10.04 repository. Now, all the commands in the tutorial " http://www.ros.org/wiki/ROS/Tutorials/NavigatingTheFilesystem" doesn't work for me any more. For example, let's try the very first command in the tutorial. "jiapei@jiapei-laptop:~$ rospack find roscpp No command 'rospack' found, did you mean: Command 'respack' from package 'moonlight-tools' (universe) rospack: command not found" I'm guessing there is a catch file somewhere (I really have no idea where it is), which remembers the default directory pointing to "boxturtle" directory, which doesn't exist any longer. The default searching directory should be the current cturtle one, say: "/opt/ros/cturtle" But, which are the files that I need to modify (upgrade) for new cturtle settings? Please give me a hand. Best Regards JIA -- Welcome to Vision Open http://www.visionopen.com