cmd.txt

//Unistall Ros2


$ sudo apt remove ros-* && sudo apt autoremove

$ cd /etc/apt/sources.list.d/ && sudo rm ros2.list

sudo apt autoremove
sudo reboot



//Uninstall NVIDIA


sudo apt remove --purge nvidia-* && sudo apt autoremove --purge

sudo apt clean




///Node Build

https://docs.ros.org/en/humble/Tutorials/Beginner-Client-Libraries/Writing-A-Simple-Py-Publisher-And-Subscriber.html



colcon build --packages-select py_pubsub
source install/setup.bash
ros2 run py_pubsub listener 



shoukat@shoukat-MS-7C02:~/bckp/Node$ colcon build --packages-select py_pubsub
[1.352s] WARNING:colcon.colcon_core.prefix_path.colcon:The path '/home/shoukat/bckp-AWSIM/ros2_ws/install' in the environment variable COLCON_PREFIX_PATH doesn't exist

soln: unset all path
unset CMAKE_PREFIX_PATH
 unset AMENT_PREFIX_PATH