title: After installing with pip, "jupyter: command not found"
body: <p>After installing with <code>pip install jupyter</code>, terminal still cannot find <code>jupyter notebook</code>.  </p>
  
  <p>Ubuntu simply says <code>command not found</code>.  Similar with <code>ipython</code>.  Did <code>pip</code> not get install properly or something?  How does Ubuntu know where to look for executables installed with <code>pip</code>?</p>