package gforge-db-postgresql 5.0.2-5 failed to install/upgrade: subprocess installed post-installation script returned error exit status 255

[alankar bajpai]

I don't know what is the use of that package and I never tried to install it.
but whenever I install any other package then at the time of completion, a dialog box appears with an error message that "All the changes are not applied successfully" and specify this package name....

ProblemType: Package
DistroRelease: Ubuntu 11.04
Package: gforge-db-postgresql 5.0.2-5
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
Architecture: i386
Date: Wed Jul 27 00:43:37 2011
ErrorMessage: subprocess installed post-installation script returned error exit status 255
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
PackageArchitecture: all
SourcePackage: fusionforge
Title: package gforge-db-postgresql 5.0.2-5 failed to install/upgrade: subprocess installed post-installation script returned error exit status 255
UpgradeStatus: No upgrade log present (probably fresh install)