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python - jupyter notebook import error: no module named 'matplotlib'

I'm an ubuntu 16.4 user and I installed anaconda3 and using both python2 and python3 kernels.

>>>jupyter kernelspec list Available kernels: python2 /home/peterkim/.local/share/jupyter/kernels/python2 python3 /home/peterkim/anaconda3/share/jupyter/kernels/python3

and.. the problem was that I don't know where/how to install packages in order to for my python2 jupyter notebook not to make error 'no module named ...'. I tried pip install matplotlib and conda install matplotlib and I also appended '/home//anaconda2/pkgs' to the sys.path.

(I also installed anaconda2 in search of the way of using parallel kernels. After I realised that anaconda2 was not needed. but I didn't uninstall it.)

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When using python3 version of jupyter (pip3 install jupyter), matplotlib has to be installed using pip3: pip3 install matplotlib


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