The answer I got is that this may be a bug, ubuntu-release-upgrader
should deactivate your apt-pinning. Can you see if the logs of the
upgrade are still in /var/log/dist-upgrade and upload all the files
there to this bug report?
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1068591
Title:
release upgrade should deactivate /etc/apt/preferences*
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