Resolved:
1. Removed the emacs ppa.
2. Re-installed the official emacs package.
Until I did step 2, the upgrade would not proceed.
Thanks for your assistance.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/1767357
Title:
upgrade from 16.04 to 18.04 fails "Could not calculate the upgrade"
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