jupyter-client has to be installed but “jupyter kernelspec --version” exited with code 127

Question

I have already installed Jupyter notebook in my ubuntu 16.04 machine. In jupyter notebook there is by default python installed. Now I want to use R from jupyter notebook.

Answer 1

I had the same error, but in my case, I have jupyter installed in a virtual environment, so I had to start R after installing the virtual environment in order for IRkernel::installspec() to succeed.