title: Trouble starting jupyter notebook
body: <p>Apparently I do have it installed, but it won't start</p>
  
  <pre><code> jupyter --version
  4.4.0
  ThinkPad-T520:~$ ipython jupyter
  [TerminalIPythonApp] WARNING | File not found: u'jupyter'
  </code></pre>
  
  <p>Other relevant parameters:</p>
  
  <pre><code>python --version
  Python 2.7.14
  ThinkPad-T520:~$ lsb_release -a
  No LSB modules are available.
  Distributor ID: Ubuntu
  Description:    Ubuntu 18.04 LTS
  Release:    18.04
  Codename:   bionic
  </code></pre>