Thanks for your bugreport.
Could you please attach the log in /var/log/dist-upgrade/* ? It should
honor the pinning. On a upgrade it will (re)install ubuntu-desktop, this
is why you probably got network-manager, but the logs will tell the
details.
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
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Dist Upgrade overwrites pinned packages
https://bugs.launchpad.net/bugs/399538
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