No running jupyter session

I have just installed atom-notebook after encountering the [`nan.h` issue](https://github.com/jupyter/atom-notebook/issues/45).

The installation seemed to be ok, but in `preference>packages>atom-notebook` I see the `uninstall` and `disable` options but not the `settings` one.

Furthermore, similar to https://github.com/jupyter/atom-notebook/issues/36, the ipynb are opened like text documents.

`python3 -m ipykernel.kernelspec --user` returns

`Installed kernelspec python3 in /home/jrking/.local/share/jupyter/kernels/python3`

and `jupyter kernelspec list` returns

```
Available kernels:
python2 /home/jrking/.local/share/jupyter/kernels/python2
python3 /home/jrking/.local/share/jupyter/kernels/python3
```

Not sure what I can do from here...