E: Sub-process /usr/bin/dpkg returned an error code (1)

[scano001]

During an upgrade command
Reading state information... Done
The following packages will be upgraded:
  apparmor apt apt-transport-https apt-utils curl initramfs-tools
  initramfs-tools-bin isc-dhcp-client isc-dhcp-common libapt-inst1.4
  libapt-pkg4.12 libasn1-8-heimdal libcurl3 libcurl3-gnutls libcurl3-nss
  libgnutls26 libgssapi3-heimdal libhcrypto4-heimdal libheimbase1-heimdal
  libheimntlm0-heimdal libhx509-5-heimdal libkrb5-26-heimdal libpci3
  libroken18-heimdal libsyncdaemon-1.0-1 libwind0-heimdal libx11-6 libx11-data
  pciutils python-ubuntuone-client rsyslog tzdata tzdata-java ubuntuone-client
  w3m

Fault

Processing triggers for initramfs-tools ...
update-initramfs: Generating /boot/initrd.img-3.8.0-31-generic
Processing triggers for menu ...
Errors were encountered while processing:
 samba4
E: Sub-process /usr/bin/dpkg returned an error code (1)

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: samba4 4.0.0~alpha18.dfsg1-4ubuntu2
ProcVersionSignature: Ubuntu 3.8.0-30.44~precise1-generic 3.8.13.6
Uname: Linux 3.8.0-30-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.4
Architecture: amd64
Date: Tue Oct 1 10:04:54 2013
DuplicateSignature: package:samba4:4.0.0~alpha18.dfsg1-4ubuntu2:subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationMedia: Ubuntu-Server 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.2)
MarkForUpload: True
SourcePackage: samba4
Title: package samba4 4.0.0~alpha18.dfsg1-4ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.