package samba4 not installed failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Sybren van der Meer]

Binary package hint: samba4

Via Synaptic I did install samba4 now: only during upgrading-process samba4 failed to install

ProblemType: Package
DistroRelease: Ubuntu 11.04
Package: samba4 (not installed)
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Fri Apr 29 19:46:31 2011
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
SourcePackage: samba4
Title: package samba4 (not installed) failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to natty on 2011-04-28 (1 days ago)