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

[Tony vdP]

The system reported the error when I powered up the computer

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: samba4 4.0.0~alpha18.dfsg1-4ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-44.69-generic-pae 3.2.44
Uname: Linux 3.2.0-44-generic-pae i686
ApportVersion: 2.0.1-0ubuntu17.2
AptOrdering: samba4: Configure
Architecture: i386
Date: Tue Jun 11 22:15:07 2013
DpkgHistoryLog:
 Start-Date: 2013-06-11 22:15:05
 Commandline: apt-get install libmono-winforms2.0-cil
ErrorMessage: subprocess installed post-installation script returned error exit status 126
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
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 126
UpgradeStatus: Upgraded to precise on 2012-10-21 (233 days ago)