Jupyter: can't create new notebook?

None of the other answers worked for me on Ubuntu 14.04. After 2 days of struggling, I finally realized that I needed to install the latest version of IPython (not the one in pip). First, I uninstalled ipython from my system with:

sudo apt-get --purge remove ipython
sudo pip uninstall ipython

I don't know if you need both, but both did something on my system.

Then, I installed ipython from source like this:

git clone https://github.com/ipython/ipython.git
cd ipython
sudo pip install -e . 

Note the period at the end of the last line. After this, I reran jupyter notebook and the python2 kernel was detected!

It looks like you don't have an IPython kernel installed (or any other kernel for that matter!).

There are various ways (old versions, new versions) to do this. One of the simplest ways is to use pip. From the command line enter:

pip install ipython

You may also need to register the kernel with Jupyter (see the new versions page):

python -m pip install ipykernel

python -m ipykernel install [--user] [--name <machine-readable-name>] [--display-name <"User Friendly Name">]

You should now be able to launch a Python notebook from Jupyter.

Alternatively, installing Jupyter using any of the methods on this page should ensure that the IPython kernel is already there. Personally, Anaconda has always just worked out of the box for me (when I've used it on Linux and Mac OS).

I had similar issue but looks like this its because I was using python 2.7. I was able to launch notebook by clicking on "Python 2" dropdown option.