tyomkin@w429815:~$ sage --notebook=jupyter
┌────────────────────────────────────────────────────────────────────┐
│ SageMath version 8.6, Release Date: 2019-01-15                     │
│ Using Python 2.7.16. Type "help()" for help.                       │
└────────────────────────────────────────────────────────────────────┘
Please wait while the Sage Jupyter Notebook server starts...
Traceback (most recent call last):
  File "/usr/share/sagemath/bin/sage-notebook", line 268, in <module>
    launcher(unknown)
  File "/usr/share/sagemath/bin/sage-notebook", line 100, in __init__
    main(argv)
  File "/usr/lib/python2.7/dist-packages/jupyter_core/application.py", line 266, in launch_instance
    return super(JupyterApp, cls).launch_instance(argv=argv, **kwargs)
  File "/usr/lib/python2.7/dist-packages/traitlets/config/application.py", line 657, in launch_instance
    app.initialize(argv)
  File "<decorator-gen-7>", line 2, in initialize
  File "/usr/lib/python2.7/dist-packages/traitlets/config/application.py", line 87, in catch_config_error
    return method(app, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/notebook/notebookapp.py", line 1630, in initialize
    self.init_webapp()
  File "/usr/lib/python2.7/dist-packages/notebook/notebookapp.py", line 1407, in init_webapp
    self.http_server.listen(port, self.ip)
  File "/usr/lib/python2.7/dist-packages/tornado/tcpserver.py", line 143, in listen
    sockets = bind_sockets(port, address=address)
  File "/usr/lib/python2.7/dist-packages/tornado/netutil.py", line 168, in bind_sockets
    sock.bind(sockaddr)
  File "/usr/lib/python2.7/socket.py", line 228, in meth
    return getattr(self._sock,name)(*args)
socket.error: [Errno 99] Cannot assign requested address
tyomkin@w429815:~$ sage
┌────────────────────────────────────────────────────────────────────┐
│ SageMath version 8.6, Release Date: 2019-01-15                     │
│ Using Python 2.7.16. Type "help()" for help.                       │
└────────────────────────────────────────────────────────────────────┘
sage: 2+3
5
sage: