package cron 3.0pl1-120ubuntu4 failed to install/upgrade: ErrorMessage: unable to install `/etc/crontab.dpkg-new' as `/etc/crontab': Operation not permitted

[yaswanth]

Package cron is not installed.

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: cron 3.0pl1-120ubuntu4
ProcVersionSignature: Ubuntu 3.2.0-48.74-generic-pae 3.2.46
Uname: Linux 3.2.0-48-generic-pae i686
ApportVersion: 2.0.1-0ubuntu17.3
Architecture: i386
Date: Wed Jun 19 23:12:57 2013
ErrorMessage: ErrorMessage: unable to install `/etc/crontab.dpkg-new' as `/etc/crontab': Operation not permitted
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
MarkForUpload: True
SourcePackage: cron
Title: package cron 3.0pl1-120ubuntu4 failed to install/upgrade: ErrorMessage: unable to install `/etc/crontab.dpkg-new' as `/etc/crontab': Operation not permitted
UpgradeStatus: Upgraded to precise on 2013-06-19 (0 days ago)