Failed to start the kernel on jupyter notebook

Check the kernel specifications:

$jupyter kernelspec list

This will show you the available kernels. In this case:

python3    /usr/local/etc/jupyter/kernels/python3  

Open the kernel.json file in this directory and specify the path of python you want the kernel to use in the argv key.

Updating the jupyter notebook resolved the issue for me. But remember, update it using command line. Not Anaconda Navigator

pip install -U jupyter