package postgresql-8.4 8.4.4-0ubuntu10.04 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2

[Dirk Pessarra]

Binary package hint: postgresql-8.4

Source package: postgresql-common
Release: 10.04
Package to install or remove: postgresql-8.4
I expected:
'apt-get -f install|remove postgresql' installs|removes the package
...but the following error occured:
Removing postgresql-client-8.4 ...
.: 9: Can't open /usr/share/postgresql-common/maintscripts-functions

Now it was not possible to install or remove the package.
Notice that the directory /usr/share/postgresql-common was removed by mistake before.

ProblemType: Package
DistroRelease: Ubuntu 10.04
Package: postgresql-8.4 8.4.4-0ubuntu10.04
ProcVersionSignature: Ubuntu 2.6.32-24.42-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-24-generic i686
Architecture: i386
Date: Fri Sep 24 14:43:07 2010
ErrorMessage: subprocess installed post-installation script returned error exit status 2
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
SourcePackage: postgresql-8.4
Title: package postgresql-8.4 8.4.4-0ubuntu10.04 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2