One more clue:  In /var/log/dist-upgrade/main.log, I see the message:

2015-09-08 11:33:49,918 ERROR Dist-upgrade failed: 'E:Error,
pkgProblemResolver::Resolve generated breaks, this may be caused by held
packages.'

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https://bugs.launchpad.net/bugs/1493491

Title:
  Failure while attempting to upgrade from 14.04 to 14.10

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