package hostname 4.0.0~alpha18.dfsg1-4ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 126

[wagung]

the system report problem give error message, in progress installation samba4 using synaptic package manager,
I'm using Lubuntu 12.04 LTS

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: samba4 4.0.0~alpha18.dfsg1-4ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic i686
ApportVersion: 2.0.1-0ubuntu5
Architecture: i386
Date: Mon May 21 22:48:53 2012
ErrorMessage: subprocess installed post-installation script returned error exit status 126
InstallationMedia: Lubuntu 12.04 "Precise Pangolin" - Release i386 (20120423)
SourcePackage: samba4
Title: package hostname 4.0.0~alpha18.dfsg1-4ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 126
UpgradeStatus: No upgrade log present (probably fresh install)