ModuleNotFoundError: No module named 'jupyter_core'

I am using a windows machine to start Jupyter notebook server on a virtual Ubuntu 16.04. I expect a URL as an output which I can paste in internet browser and run a .ipynb file. jupyter notebook --ip 0.0.0.0 is producing the following error after I have upgraded Python to 3.7.

*(Earlier to upgradation, the jupyter notebook was working fine)

pkj_admin@ip-50-60-0-75:~$  jupyter notebook --ip 0.0.0.0   Traceback (most recent call last):  File "/usr/local/bin/jupyter", line 5, in <module>   from jupyter_core.command import mainModuleNotFoundError: No module named 'jupyter_core'

Thanks