package postgresql-8.4 8.4.10-0ubuntu0.11.04.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Peeter]

Update manager told me this upgrade was available. I tried to upgrade it, but the upgrade failed.

ProblemType: Package
DistroRelease: Ubuntu 11.04
Package: postgresql-8.4 8.4.10-0ubuntu0.11.04.1
ProcVersionSignature: Ubuntu 2.6.38-13.53-generic 2.6.38.8
Uname: Linux 2.6.38-13-generic i686
Architecture: i386
Date: Mon Jan 16 13:21:05 2012
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
SourcePackage: postgresql-8.4
Title: package postgresql-8.4 8.4.10-0ubuntu0.11.04.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)