There is an issue in the postinst of the deb package. It will try to replace the existing /etc/postfixadmin/config.inc.php through ucf, which is generally fine, but in rules, an default config is already placed there (line 29). This causes ucf to give a confusing warning on a clean install, cause dbconfig-common wants to replace the empty, default config with the one that was just generated.
To fix this, just don't place a default config in /etc.
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