There isn't a package called "packagename" in your current software sources error on some apps in software center

[Amardhruva]

in my 64 bit system when i try to install some apps the error appears
notable apps
steam
zsnes

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: software-center 13.10-0ubuntu4.1
ProcVersionSignature: Ubuntu 3.16.0-31.43-generic 3.16.7-ckt5
Uname: Linux 3.16.0-31-generic x86_64
ApportVersion: 2.14.7-0ubuntu8.2
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Mar 21 16:33:59 2015
ExecutablePath: /usr/share/software-center/software-center
InstallationDate: Installed on 2015-03-05 (15 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 LANGUAGE=en_IN:en
 XDG_RUNTIME_DIR=<set>
 LANG=en_IN
 SHELL=/bin/bash
SourcePackage: software-center
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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

[Paul White (paulw2u)]

Ubuntu 14.10 (utopic) reached end-of-life on July 23, 2015.

This release of Ubuntu is no longer receiving maintenance updates. If this is still an issue using a maintained version of Ubuntu please let us know.

Paul White
[Ubuntu Bug Squad]

[Launchpad Janitor (janitor)]

[Expired for One Hundred Papercuts because there has been no activity for 60 days.]

[Launchpad Janitor (janitor)]

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