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

[indymaynard]

Upgrade from 10.04 LTS to 12.04 LTS using precise.

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: samba4 4.0.0~alpha18.dfsg1-4ubuntu2
ProcVersionSignature: Ubuntu 2.6.32-41.91-generic 2.6.32.59+drm33.24
Uname: Linux 2.6.32-41-generic i686
ApportVersion: 2.0.1-0ubuntu11
Architecture: i386
Date: Wed Jul 18 11:47:52 2012
ErrorMessage: ErrorMessage: subprocess installed post-installation script returned error exit status 126
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
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: Upgraded to precise on 2012-07-18 (0 days ago)