We currently check this:

if [ -z "$2" -a -n "$RELEASE_UPGRADE_IN_PROGRESS" ]; then
    db_set shared/default-x-display-manager lightdm
    db_fset shared/default-x-display-manager seen true
else
    db_input high shared/default-x-display-manager || :
    db_go || :
fi

update-manager sets $RELEASE_UPGRADE_IN_PROGRESS, so it seems in your
upgrade method this wasn't set. Was your upgrade done using apt-get
dist-upgrade? In that case we actually expect the prompt.

If it was from do-release-upgrade, it's meant to not show. We shouldn't
have a previously installed lightdm in that case, so the  -z "$2"  part
ought to be okay. Do you happen to have full logs from that upgrade
still?

Thanks!

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https://bugs.launchpad.net/bugs/911813

Title:
  Lucid to Precise: debconf prompt about which DM to use during upgrade

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