package samba4 4.0.0~alpha18.dfsg1-4ubuntu2 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 126

samba cannot be installed or removed in Ubuntu 12.04 dlxe

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: samba4 4.0.0~alpha18.dfsg1-4ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-81.117-generic 3.2.68
Uname: Linux 3.2.0-81-generic i686
ApportVersion: 2.0.1-0ubuntu17.8
Architecture: i386
Date: Mon Apr 20 20:42:59 2015
ErrorMessage: ErrorMessage: subprocess installed post-installation script returned error exit status 126
InstallationMedia: LXLE 32-bit 12.04.4 - Release i386
MarkForUpload: True
SourcePackage: samba4
Title: package samba4 4.0.0~alpha18.dfsg1-4ubuntu2 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 126
UpgradeStatus: No upgrade log present (probably fresh install)