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I downloaded your workspace. It seems that some things haven't been initialized properly. If I source it and type roscd I end up in pubsub_ws/devel. But I cannot roscd the packages. Can you run the following ?
cd ~/pubsub_ws
rm -rf build/ devel/ install/ src/CMakeLists.txt
cd src catkin_init_workspace
catkin_make
source devel/setup.bash rospack profile
roscd commands

Explaination : When I ran rospack profile I never saw yiur workspace showing in the list. So your packages were never in the $ROS_PACKAGE_PATH. To fix it you need to reinitialize your workspace. then rebuild it and update your package list (the list of commands above).Then everything should be working.