package iscsitarget 1.4.20.2-5ubuntu3 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 1

[Aniruddha]

While upgrading from 11.04 to 12.04 this was observed.
This was a partial upgrade.

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: iscsitarget 1.4.20.2-5ubuntu3
ProcVersionSignature: Ubuntu 3.0.0-17.30-generic-pae 3.0.22
Uname: Linux 3.0.0-17-generic-pae i686
ApportVersion: 2.0.1-0ubuntu5
Architecture: i386
Date: Fri Apr 27 09:57:37 2012
ErrorMessage: ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
SourcePackage: iscsitarget
Title: package iscsitarget 1.4.20.2-5ubuntu3 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to precise on 2012-04-27 (0 days ago)

[Launchpad Janitor (janitor)]

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