Such dist-upgrade is not supported.
This is allowed (and tested) from LTS to next LTS; and from n to n+1.
All others cases are not tested nor supported, and are expected to fail.
Indeed before upgrading, the system needs to be set back to 'genuine' status
(purging ppa) ; which is the case with your installation.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1606301
Title:
Upgrade to Ubuntu 16.10 from 15.10
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