Oops, I should have also mentioned:

Of course, all 12gb were being recognized before the motherboard (MB)
replacement.  No kernel updates or any other kind of updates were
applied during the 2-3 day period between when I installed the new MB
and noticed the lacking 4gb of RAM.

I did force a kernel reinstall (i.e., "dpkg --reinstall install ...")
but that did not correct the problem.

At least two kernel updates have been applied since reinstalling the MB
(which occurred about 4-5 weeks ago).  No updates seems to have
corrected the problem, either.

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https://bugs.launchpad.net/bugs/1321938

Title:
  Ubuntu 12.04 LTS lshw sees 12gb RAM but system only using 8gb

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