/home/youruser/catkin_ws/src:/opt/ros/kinetic/share: There is no such file or directory

edit

You are on the right track and only need minor assistance. Please read below:

1. It seems you are getting confused about the source command. First of all, because you are in Ubuntu 20.04, you should use ROS Noetic. Therefore, please replace the text kinetic with noetic in every command.

2. Next, after installing ROS Noetic, you should be able to source it. For example, you can see ROS-related environment variables after sourcing it, as shown below:

   ravi@dell:~$ printenv | grep ROS
   
   ravi@dell:~$ source /opt/ros/noetic/setup.bash
   
   ravi@dell:~$ printenv | grep ROS
   ROS_VERSION=1
   ROS_PYTHON_VERSION=3
   ROS_PACKAGE_PATH=/opt/ros/noetic/share
   ROSLISP_PACKAGE_DIRECTORIES=
   ROS_ETC_DIR=/opt/ros/noetic/etc/ros
   ROS_MASTER_URI=http://localhost:11311
   ROS_ROOT=/opt/ros/noetic/share/ros
   ROS_DISTRO=noetic
   

   Most importantly, you can notice that ROS_DISTRO is set to noetic and ROS_PACKAGE_PATH is set to the installation directory.

3. You are good to go if you see a similar output on your side. Now, you can create a workspace as you were doing before. Please see the below commands:

   ravi@dell:~$ mkdir -p ~/catkin_ws/src
   ravi@dell:~$ cd catkin_ws/
   

4. We have created an empty workspace. Now, we should compile it. Before executing catkin_make, do not forget to source your ROS installation as shown below:

   ravi@dell:~/catkin_ws$ source /opt/ros/noetic/setup.bash
   ravi@dell:~/catkin_ws$ catkin_make
   Base path: /home/ravi/catkin_ws
   Source space: /home/ravi/catkin_ws/src
   Build space: /home/ravi/catkin_ws/build
   Devel space: /home/ravi/catkin_ws/devel
   Install space: /home/ravi/catkin_ws/install
   Creating symlink "/home/ravi/catkin_ws/src/CMakeLists.txt" pointing to "/opt/ros/noetic/share/catkin/cmake/toplevel.cmake"
   ####
   #### Running command: "cmake /home/ravi/catkin_ws/src -DCATKIN_DEVEL_PREFIX=/home/ravi/catkin_ws/devel -DCMAKE_INSTALL_PREFIX=/home/ravi/catkin_ws/install -G Unix Makefiles" in "/home/ravi/catkin_ws/build"
   ####
   -- The C compiler identification is GNU 9.4.0
   -- The CXX compiler identification is GNU 9.4.0
   -- Check for working C compiler: /usr/bin/cc
   -- Check for working C compiler: /usr/bin/cc -- works
   -- Detecting C compiler ABI info
   -- Detecting C compiler ABI info - done
   -- Detecting C compile features
   -- Detecting C compile features - done
   -- Check for working CXX compiler: /usr/bin/c++
   -- Check for working CXX compiler: /usr/bin/c++ -- works
   -- Detecting CXX compiler ABI info
   -- Detecting CXX compiler ABI info - done
   -- Detecting CXX compile features
   -- Detecting CXX compile features - done
   -- Using CATKIN_DEVEL_PREFIX: /home/ravi/catkin_ws/devel
   -- Using CMAKE_PREFIX_PATH: /opt/ros/noetic
   -- This workspace overlays: /opt/ros/noetic
   -- Found PythonInterp: /usr/bin/python3 (found suitable version "3.8.10", minimum required is "3") 
   -- Using PYTHON_EXECUTABLE: /usr/bin/python3
   -- Using Debian Python package layout
   -- Found PY_em: /usr/lib/python3/dist-packages/em.py  
   -- Using empy: /usr/lib/python3/dist-packages/em.py
   -- Using CATKIN_ENABLE_TESTING: ON
   -- Call enable_testing()
   -- Using CATKIN_TEST_RESULTS_DIR: /home/ravi/catkin_ws/build/test_results
   -- Forcing gtest/gmock from source, though one was otherwise available.
   -- Found gtest sources under '/usr/src/googletest': gtests will be built
   -- Found gmock sources under '/usr/src/googletest': gmock will be built
   -- Found PythonInterp: /usr/bin/python3 (found version "3.8.10") 
   -- Found Threads: TRUE  
   -- Using Python ...