update manger denies because of unofficial softwares in ubuntu

[rajith raman]

ould not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade:
E:Unable to correct problems, you have held broken packages.

 This can be caused by:
 * Upgrading to a pre-release version of Ubuntu
 * Running the current pre-release version of Ubuntu
 * Unofficial software packages not provided by Ubuntu

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.14.9
ProcVersionSignature: Ubuntu 3.2.0-29.46-generic 3.2.24
Uname: Linux 3.2.0-29-generic i686
NonfreeKernelModules: wl
ApportVersion: 2.0.1-0ubuntu12
Architecture: i386
Date: Thu Aug 16 14:57:55 2012
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
PackageArchitecture: all
SourcePackage: update-manager
UpgradeStatus: Upgraded to precise on 2012-04-28 (109 days ago)

[Jean-Baptiste Lallement (jibel)]

Thanks for your report.

Could you please attach the output of the command:
$ sudo apt-get -o Debug::pkgProblemResolver=true dist-upgrade

Thanks in advance.

[Launchpad Janitor (janitor)]

[Expired for update-manager (Ubuntu) because there has been no activity for 60 days.]