Muon does not find available packages to install

After a fresh installation of Kubuntu 12.10, Muon Package Manager and Muon Software Installer don't find any of the available packages to install.
Steps:
1) Do a fresh installation of Kubuntu 12.10 i386.
2) Open Muon Package Manager.
3) On the "Search" field, type the name of a package you know exists, (kopete, wine, kaffeine).

What is hapening now?
Muon gives you a blank list of packages.

What should happen instead?
Muon should gives you a list with packages related to your seach terms.

Plaese take a look to the screen-shot i'm attaching.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: muon 1.4.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-19.30-generic 3.5.7
Uname: Linux 3.5.0-19-generic i686
ApportVersion: 2.6.1-0ubuntu9
Architecture: i386
Date: Fri Dec 14 15:47:54 2012
InstallationDate: Installed on 2012-12-14 (0 days ago)
InstallationMedia: Kubuntu 12.10 "Quantal Quetzal" - Release i386 (20121017.1)
MarkForUpload: True
SourcePackage: muon
UpgradeStatus: No upgrade log present (probably fresh install)