ubuntu 11.4 software center failed to download package

[muk.ptl]

ubuntu software center failed to download package
check your internet connection

but my internet connection working properly Im reporting but from the same internet connection
 synaptic package manager is working and can download software but i cant find some software in synaptic package manager wich i found on software center
software center dosent download any software

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: software-center 4.0.3
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
Architecture: i386
CheckboxSubmission: 9a45f83207c3fa890d127ee5f40105a8
CheckboxSystem: ed86e29ffba809c116a39e33fa9fc45c
Date: Mon Jun 27 11:45:57 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_IN:en
 LANG=en_IN
 LC_MESSAGES=en_IN.UTF-8
 SHELL=/bin/bash
SourcePackage: software-center
UpgradeStatus: No upgrade log present (probably fresh install)

[jeremy-list (quick-dudley)]

I'm not sure whether this is related or not: but apt is complaining that a lot of the packages in the ubuntu repository cannot be authenticated: is the default installation missing a public key? If so, where can we find it to add it?

[alok kumar (alokkhg)]

i uninstalled azeurus from my system and this problem started.

[Michael Vogt (mvo)]

Thanks for your bugreport.

If this is still a problem, could you please run:
$ apt-get install --simulate 2vcard
and let me know what that outputs? It might be a unauthenticated packages issue.

[Kiwinote (kiwinote)]

Hi!

Thanks for your bug report and sorry for the delayed response.
As you may be aware, during each cycle a lot of work goes into
software-center. However, over time we build up a long list of
bugs which are most likely no longer present in recent versions
of software-center.

In an attempt to clean up the bug list for software-center I am
expiring this bug because it was filed against an old version of
software-center which shipped in Ubuntu 11.04 and in addition it
meets one or more of the following criteria:
- it would seem quite likely that this bug is no longer present
  in recent versions of software-center,
- the bug report does not contain sufficient information for us
  to reproduce and/or fix the bug,
- the issue is most likely in an external piece of code and has
  most likely been fixed since the bug was reported.

If you experience any problems with Software Center in Ubuntu
12.04, please do continue to report new bugs. Thanks again for
your help!