Did you receive and error message like this?
663 details = _("An unresolvable problem occurred while "
664 "calculating the upgrade.\n\n "
665 "This can be caused by:\n"
666 " * Upgrading to a pre-release version of Ubuntu\n"
667 " * Running the current pre-release version of
Ubuntu\n"
668 " * Unofficial software packages not provided by
Ubuntu\n"
669 "\n")
Do you think referencing PPAs (you had xorg packages from a PPA
installed) here would help?
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1691924
Title:
do-release-upgrade fails
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