package gufw 10.04.1-0ubuntu1 failed to upgrade: subprocess installed post-installation script returned error exit status 1: mkdir: The folder /etc/gufw already exists

[geoffreyg]

Binary package hint: gufw

upgrade-manager from 9.10 to 10.04 stopped the whole upgrade after failing at an upgrade of gufw to version 10.04.1-0ubuntu1
Manual installation via apt-get install succeeded only after deleting the folder /etc/gufw

ProblemType: Package
AptOrdering: gufw: Configure
Architecture: amd64
Date: Wed Mar 10 08:31:50 2010
DistroRelease: Ubuntu 10.04
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
NonfreeKernelModules: nvidia
Package: gufw 10.04.1-0ubuntu1
PackageArchitecture: all
ProcVersionSignature: Ubuntu 2.6.32-16.25-generic
SourcePackage: gui-ufw
Title: package gufw 10.04.1-0ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
Uname: Linux 2.6.32-16-generic x86_64