In Ubuntu 18.04 dazu in /usr/share/phppgadmin/conf/config.inc.php gucken.
Bei Zeile 90 findet man:
// If extra login security is true, then logins via phpPgAdmin with no // password or certain usernames (pgsql, postgres, root, administrator) // will be denied. Only set this false once you have read the FAQ and // understand how to change PostgreSQL's pg_hba.conf to enable // passworded local connections. $conf['extra_login_security'] = true;
Auf false setzen und es funzt.