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ROS for Raspberry Pi 4

Hello

I am a beginner trying to use ROS Kinetic on Raspberry Pi 4. The RPi 4 is loaded with the Raspbian Buster OS. I tried installing ROS kinetic using the following link: http://wiki.ros.org/ROSberryPi/Installing%20ROS%20Kinetic%20on%20the%20Raspberry%20Pi

Despite this, I am unable to run the basic commands like roscore, rosrun, etc. without an error saying that bash: the command is not found in the directory. Also, I have not installed any Ubuntu Mate image on my SD card. Is it a prerequisite?

After uninstalling Kinetic, i tried installing Melodic using the following link: https://www.seeedstudio.com/blog/2019/08/01/installing-ros-melodic-on-raspberry-pi-4-and-rplidar-a1m8/

I got an Import error during 'sudo rosdep init' saying that the rospkg.os was not found. If possible, could anybody give me detailed guidelines on how to install ROS on RPi4? Would be really appreciated.

Thank you.