ipython server can't launch: No module named notebook.notebookapp

I've been trying to setup an ipython server following several tutorials (since none was exactly my case). A couple days ago, I did manage to get it to the point where it was launching but then was not able to access it via url. Today it's not launching anymore and I can't find much about this specific error I get:

    Traceback (most recent call last):
      File "/usr/local/bin/ipython", line 9, in <module>
        load_entry_point('ipython==4.0.0-dev', 'console_scripts', 'ipython')()
      File "/usr/local/lib/python2.7/dist-packages/ipython-4.0.0_dev-py2.7.egg/IPython/__init__.py", line 118, in start_ipython
        return launch_new_instance(argv=argv, **kwargs)
      File "/usr/local/lib/python2.7/dist-packages/traitlets-4.0.0-py2.7.egg/traitlets/config/application.py", line 591, in launch_instance
        app.initialize(argv)
      File "<string>", line 2, in initialize
      File "/usr/local/lib/python2.7/dist-packages/traitlets-4.0.0-py2.7.egg/traitlets/config/application.py", line 75, in catch_config_error
        return method(app, *args, **kwargs)
      File "/usr/local/lib/python2.7/dist-packages/ipython-4.0.0_dev-py2.7.egg/IPython/terminal/ipapp.py", line 302, in initialize
        super(TerminalIPythonApp, self).initialize(argv)
      File "<string>", line 2, in initialize
      File "/usr/local/lib/python2.7/dist-packages/traitlets-4.0.0-py2.7.egg/traitlets/config/application.py", line 75, in catch_config_error
        return method(app, *args, **kwargs)
      File "/usr/local/lib/python2.7/dist-packages/ipython-4.0.0_dev-py2.7.egg/IPython/core/application.py", line 386, in initialize
        self.parse_command_line(argv)
      File "/usr/local/lib/python2.7/dist-packages/ipython-4.0.0_dev-py2.7.egg/IPython/terminal/ipapp.py", line 297, in parse_command_line
        return super(TerminalIPythonApp, self).parse_command_line(argv)
      File "<string>", line 2, in parse_command_line
      File "/usr/local/lib/python2.7/dist-packages/traitlets-4.0.0-py2.7.egg/traitlets/config/application.py", line 75, in catch_config_error
        return method(app, *args, **kwargs)
      File "/usr/local/lib/python2.7/dist-packages/traitlets-4.0.0-py2.7.egg/traitlets/config/application.py", line 487, in parse_command_line
        return self.initialize_subcommand(subc, subargv)
      File "<string>", line 2, in initialize_subcommand
      File "/usr/local/lib/python2.7/dist-packages/traitlets-4.0.0-py2.7.egg/traitlets/config/application.py", line 75, in catch_config_error
        return method(app, *args, **kwargs)
      File "/usr/local/lib/python2.7/dist-packages/traitlets-4.0.0-py2.7.egg/traitlets/config/application.py", line 418, in initialize_subcommand
        subapp = import_item(subapp)
      File "build/bdist.linux-x86_64/egg/ipython_genutils/importstring.py", line 31, in import_item
    ImportError: No module named notebook.notebookapp

So about the setup, I have installed the anaconda distrib of ipython, pyzmq & tornado libraries. I have created a profile nbserver and the config file is as follows - ipython.config.py:

    c = get_config()
    c.IPKernalApp.pylab = 'inline'
    c.NotebookApp.certfile = u'/home/ludo/.ipython/profile_nbserver/mycert.pem'
    c.NotebookApp.ip = '*'
    c.NotebookApp.open_browser = False
    c.NotebookApp.password = u'sha1:e6cb2aa9a[...]'
    c.NotebookApp.port = 9999
    c.NotebookManager.notebook_dir = u'/var/www/ipynb/'
    c.NotebookApp.base_project_url = '/ipynb/'
    c.NotebookApp.base_kernel_url = '/ipynb/'
    c.NotebookApp.webapp_settings = {'static_url_prefix':'/ipynb/static/'}

I really don't know where to look for clues anymore - and I'm probably lacking a greater understanding of how all this works to figure it out. My ultimate goal is to then use the answer to this question on SO to complete a setup behind apache and eventually connect it to colaboratory - but seems like it should launch first.

Many thanks for any help :)

This should fix the issue:

    pip install jupyter

From: stackoverflow.com/q/31397421