I couldn't find a kernel matching Python 2. Please select a kernel

while trying to run
jupyter notebook &

i received rather cryptic message when I tried to view my notebook in jupiter:
"I couldn't find a kernel matching Python 2. Please select a kernel"

I ran following command to find out that indeed, I have no kernels available
jupyter kernelspec list

After installing ipykernel through anaconda I was back in business
conda install ipykernel

$ jupyter kernelspec list
Available kernels:
  python2    conda/lib/python2.7/site-packages/ipykernel/resources

and you have to restart the notebook of course...