Noting further: There's a Note at the bottom of the entry for Queue in 17.2.2.2,
https://docs.python.org/3.5/library/multiprocessing.html#pipes-and-queues
which says that ImportErrors can be caused by failure of the system to support 
semaphores, as outlined in Issue3770 (Closed years ago):
https://bugs.python.org/issue3770

Does Xubuntu not have basic IPCs such as semaphores?  Is it a problem in
how Python is built?

** Bug watch added: Python Roundup #3770
   http://bugs.python.org/issue3770

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https://bugs.launchpad.net/bugs/1628763

Title:
  Example of Queue from documentation fails

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