Jupyterhub uses a specific python version when creating new notebooks.
I can't find out where to set this version.
I installed anaconda on my ubuntu and created a link between python and anaconda's distribution
usr/bin$ ls -l pyt*
lrwxrwxrwx 1 root root 24 Feb 9 18:34 python -> /usr/anaconda/bin/python
Python 3.5.1 |Anaconda 2.5.0 (64-bit)| (default, Dec 7 2015, 11:16:01)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-1)] on linux
Type "help", "copyright", "credits" or "license" for more information.
If you want use your python version, then you have to create a new kernel. Technically your specific kernel. I'll attach a website which explains how you can undergo this process: Install known Python version
Hope it helps!