I am having trouble opening the IPython notebook and I am getting this final error. I am using Ubuntu.
OSError: /home/tash/.local/lib/python2.7/site-packages/zmq/libzmq.so: undefined symbol: _ZTVNSt7__cxx1118basic_stringstreamIcSt11char_traitsIcESaIcEEE
It seems to be a problem with "zmq" package maybe (http://pyzmq.readthedocs.io/en/latest/api/zmq.html)
can you try to move this folder, and see it solve the problem
mv /home/tash/.local/lib/python2.7/site-packages/zmq /tmp
You can always move it back if you like, using:
mv /tmp/zmq /home/tash/.local/lib/python2.7/site-packages