Solved by Adam_Chrzanowski in post #3 
              
              
                I figure it out :D. You are right. 
This command isn’t working properly with conda env. 
python -m ipykernel install --user --name=notebook_env 

Instead, we should first install nb_conda_kernels in active conda env 
conda install -n notebook_env nb_conda_kernels

and then run above command like thi…