Michael,

does update-manager set something that /var/lib/dpkg/info/lightdm.config
can read to see whether this is a dist-upgrade instead of a normal
package installation? Or can it be changed to export something which
indicates that? Or can lightdm.config just check if update-manager is in
its parental chain?

Then the db_input could be guarded:

 if [ dist_upgrade running ];
    # set default to lightdm
else
    db_input
fi

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https://bugs.launchpad.net/bugs/806559

Title:
  debconf prompt about DM to use during natty->oneiric

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