As you've discovered it is not enough to just disable PPAs as the those
PPAs may have provided package version numbers greater than the versions
in the release to which you are trying to upgrade. This then can cause
problems for the release upgrade calculation. For future reference there
is a tool called ppa-purge which will disable PPAs and downgrade package
versions to those from the official Ubuntu archive.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1510016
Title:
Cannot upgrade to Ubuntu 15.10 (Could not calculate the upgrade)
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