jupyter-client has to be installed but “jupyter ke

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.

To do so I followed IRkernel installation link and run below commands:

install.packages('devtools')

devtools::install_github('IRkernel/IRkernel')

But when I run IRkernel::installspec() command it shows below error:

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

I am now confused why this error occurs.

Answer 1

Running this command from RStudio will show this error. When you run this command from command line/ terminal then everything will be fine.

So just type R from your command line.

Then Run below commands:

install.packages('devtools')

devtools::install_github('IRkernel/IRkernel')

IRkernel::installspec()

Answer 2

I have solved with this:

sudo ln -s /home/'my user name'/anaconda3/bin/jupyter /usr/bin/jupyter

Answer 3

I had the same issue; I added the following in the ~/.bashrc (and source) and then tried running IRkernel::installspec() and it worked:

export PATH="~/anaconda3/bin:$PATH"

Answer 4

I had the same problem but none of the above solutions worked for me. I was using Debian 9 with the default versions of python and R. I had to delete installed programs and compile latest versions of both from source. For Python compiling I had to use this configuration https://github.com/sloria/TextBlob/issues/173

Answer 5

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.

Answer 6

On some Windows systems you may not succeed even if you run R from cmd / powershell. That's the case on my machine. My workaround is to run R from Anaconda Prompt (if you installed Jupyter via Anaconda). You may need to specify the full path if R is not on your PATH.

I think this is some problem related to the PATH, however I had no luck adding Anaconda\Lib\site-packages\jupyter_client to my system PATH.