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
After much testing, I ended up uninstalling all the "foreign" packages
in /var/log/dist-upgrade/main.log and the update is in progress now. I'd
say it was cinnamon what was preventing the upgrade.
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Update: I just enabled the vivid-proposed repository, which made some
updates available. However, after installing all of them and restarting
the system, the problem persists.
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