It looks like you have some emacs packages installed from a PPA which
then cause a failure to calculate the upgrade.
2018-04-27 07:50:07,840 DEBUG Foreign: emacs25 emacs25-common
emacs25-el
Please remove the the PPA and switch to the official versions of the
packages using 'paa-purge'. After that the upgrade should proceed.
Thanks!
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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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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