package ubuntu-keyring 2011.11.21.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2

I was trying to upgrade some programs . And teminal says that my signing key's weren't upgraded

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: ubuntu-keyring 2011.11.21.1
ProcVersionSignature: Ubuntu 3.2.0-31.50-generic-pae 3.2.28
Uname: Linux 3.2.0-31-generic-pae i686
ApportVersion: 2.0.1-0ubuntu12
Architecture: i386
Date: Tue Oct 2 12:06:52 2012
Dependencies:

ErrorMessage: subprocess installed post-installation script returned error exit status 2
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
PackageArchitecture: all
SourcePackage: ubuntu-keyring
Title: package ubuntu-keyring 2011.11.21.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2
UpgradeStatus: No upgrade log present (probably fresh install)