postgresql-contrib 7.5.21 (i386 binary) in ubuntu edgy

 This is a transitional package to automatically migrate to the new
 multicluster/multiversion structure provided by postgresql-common and
 postgresql-<version>. You can safely remove this package after a
 successful installation.
 .
 The PostgreSQL contrib package provides several additional features for
 the PostgreSQL database. contrib often serves as a testbed for features
 before they are adopted into PostgreSQL proper.
 .
 PostgreSQL is an object-relational SQL database management system.