libnss-pgsql2 binary package in Ubuntu Precise i386

 This module works as a replacement for the flat file databases /etc/passwd,
 /etc/group etc. It is a plugin to glibc's name service switch.
 .
 The module uses tables in a PostgreSQL database to store user, group, and
 shadow information. The module can be configured to use custom queries to
 retrieve it's information from a database. The module allows to separate the
 configuration for shadow information from group and user information to
 restrict access to shadow information to privileged users (i.e. root or the
 shadow group).

Source package