package openerp-server 5.0.14-1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

subprocess failed

ProblemType: Package
DistroRelease: Ubuntu 11.04
Package: openerp-server 5.0.14-1
ProcVersionSignature: Ubuntu 2.6.38-12.51-generic 2.6.38.8
Uname: Linux 2.6.38-12-generic x86_64
NonfreeKernelModules: fglrx
AptOrdering: openerp-server: Configure
Architecture: amd64
Date: Wed Nov 9 10:33:39 2011
DpkgTerminalLog:
 Setting up openerp-server (5.0.14-1) ...
 Open ERP user (openerp) already exists, doing nothing.
 chown: invalid user: `openerp:adm'
 dpkg: error processing openerp-server (--configure):
  subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
PackageArchitecture: all
SourcePackage: openerp-server
Title: package openerp-server 5.0.14-1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)