Found the problem!  Turns out it was an errant apparmor profile.  Fixed by running:

# aa-complain /etc/apparmor.d/usr.bin.man

My next step is finding out why apparmor isn't doing any logging...

Thanks all; Lawrence in particular.  :)
E

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Securely sent with Tutanota.  It's good, you should try it:  https://tutanota.com

13. Jul 2016 11:41 by ldo@geek-central.gen.nz:

On Wed, 13 Jul 2016 00:00:01 +0100 (BST), Eric Light wrote:
When I execute man, it doesn't give me
anything, and just returns me to the command prompt.  Not even man
--help will return a response. I've purged and reinstalled man-db,
ensured that ncurses-base is installed, even checked the size of man
(106912 bytes), and checked dmesg for any segfaults... there's just
nothing I can find anywhere.

According to the man(1) man page, ���man -u��� will do a cache consistency
check. Worth a try?

You could also try invoking mandb directly.
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