O problema foi corrigido ao instalar ipykernel
$ sudo pip2 install ipykernel
The directory '/home/mona/.cache/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/home/mona/.cache/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Requirement already satisfied: ipykernel in /usr/local/lib/python2.7/dist-packages
Requirement already satisfied: ipython>=4.0.0 in /usr/local/lib/python2.7/dist-packages (from ipykernel)
Requirement already satisfied: traitlets>=4.1.0 in /usr/local/lib/python2.7/dist-packages (from ipykernel)
Requirement already satisfied: tornado>=4.0 in /usr/local/lib/python2.7/dist-packages (from ipykernel)
Requirement already satisfied: jupyter-client in /usr/local/lib/python2.7/dist-packages (from ipykernel)
Requirement already satisfied: backports.shutil-get-terminal-size; python_version == "2.7" in /usr/local/lib/python2.7/dist-packages (from ipython>=4.0.0->ipykernel)
Requirement already satisfied: setuptools>=18.5 in /usr/local/lib/python2.7/dist-packages (from ipython>=4.0.0->ipykernel)
Requirement already satisfied: decorator in /usr/local/lib/python2.7/dist-packages (from ipython>=4.0.0->ipykernel)
Requirement already satisfied: pickleshare in /usr/local/lib/python2.7/dist-packages (from ipython>=4.0.0->ipykernel)
Collecting simplegeneric>0.8 (from ipython>=4.0.0->ipykernel)
/usr/local/lib/python2.7/dist-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:318: SNIMissingWarning: An HTTPS request has been made, but the SNI (Subject Name Indication) extension to TLS is not available on this platform. This may cause the server to present an incorrect TLS certificate, which can cause validation failures. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/en/latest/security.html#snimissingwarning.
SNIMissingWarning
/usr/local/lib/python2.7/dist-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:122: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/en/latest/security.html#insecureplatformwarning.
InsecurePlatformWarning
Downloading simplegeneric-0.8.1.zip
Collecting pexpect; sys_platform != "win32" (from ipython>=4.0.0->ipykernel)
Downloading pexpect-4.2.1-py2.py3-none-any.whl (55kB)
100% |████████████████████████████████| 61kB 2.2MB/s
Requirement already satisfied: pathlib2; python_version == "2.7" or python_version == "3.3" in /usr/local/lib/python2.7/dist-packages (from ipython>=4.0.0->ipykernel)
Requirement already satisfied: prompt-toolkit<2.0.0,>=1.0.3 in /usr/local/lib/python2.7/dist-packages (from ipython>=4.0.0->ipykernel)
Requirement already satisfied: pygments in /usr/local/lib/python2.7/dist-packages (from ipython>=4.0.0->ipykernel)
Requirement already satisfied: enum34; python_version == "2.7" in /usr/local/lib/python2.7/dist-packages (from traitlets>=4.1.0->ipykernel)
Requirement already satisfied: six in /usr/local/lib/python2.7/dist-packages (from traitlets>=4.1.0->ipykernel)
Requirement already satisfied: ipython-genutils in /usr/local/lib/python2.7/dist-packages (from traitlets>=4.1.0->ipykernel)
Requirement already satisfied: singledispatch in /usr/local/lib/python2.7/dist-packages (from tornado>=4.0->ipykernel)
Requirement already satisfied: certifi in /usr/local/lib/python2.7/dist-packages (from tornado>=4.0->ipykernel)
Requirement already satisfied: backports-abc>=0.4 in /usr/local/lib/python2.7/dist-packages (from tornado>=4.0->ipykernel)
Requirement already satisfied: backports.ssl-match-hostname in /usr/local/lib/python2.7/dist-packages (from tornado>=4.0->ipykernel)
Requirement already satisfied: pyzmq>=13 in /usr/local/lib/python2.7/dist-packages (from jupyter-client->ipykernel)
Requirement already satisfied: jupyter-core in /usr/local/lib/python2.7/dist-packages (from jupyter-client->ipykernel)
Requirement already satisfied: ptyprocess>=0.5 in /usr/local/lib/python2.7/dist-packages (from pexpect; sys_platform != "win32"->ipython>=4.0.0->ipykernel)
Requirement already satisfied: wcwidth in /usr/local/lib/python2.7/dist-packages (from prompt-toolkit<2.0.0,>=1.0.3->ipython>=4.0.0->ipykernel)
Installing collected packages: simplegeneric, pexpect
Running setup.py install for simplegeneric ... done
Successfully installed pexpect-4.2.1 simplegeneric-0.8.1
mona@pascal:~/libzmq/cmake-build$ jupyter notebook
/usr/local/lib/python2.7/dist-packages/IPython/paths.py:54: UserWarning: Moving ~/.config/ipython to ~/.ipython
warn('Moving {0} to {1}'.format(cu(xdg_ipdir), cu(ipdir)))
[I 18:45:16.823 NotebookApp] The port 8888 is already in use, trying another port.
[I 18:45:16.823 NotebookApp] The port 8889 is already in use, trying another port.
[I 18:45:16.830 NotebookApp] Serving notebooks from local directory: /home/mona/libzmq/cmake-build
[I 18:45:16.830 NotebookApp] 0 active kernels
[I 18:45:16.830 NotebookApp] The Jupyter Notebook is running at: http://localhost:8890/
[I 18:45:16.830 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).