Can't log in from software-center

[Máté Eckl]

Since I installed Ubuntu 14.04 on my laptop I can't log in to the software center, and therefore I can't install already-bought programs, get recommendations and so on. I suppose it's because of the lack of Ubuntu One packages, which, as far as I know, were to synchronize data with the servers of Canonical. (I remember that when the previous release I tried to uninstall Ubuntu One I read some package descriptions that seemed to work for software center sync.)
When I click on 'switch on recommendations' (translated from Hungarian) it seems to load, but finally nothing happens. When I try to install already-bought packages nothing happens ether. I can see the blank list of applications which is wrong, because I have bought 2 one before. Some days ago I tried to do this and a window prompted saying that I am not logged in and therefore can't see the list, but now I can't reproduce it.

It was installed freshly in april, not updated from previous release, but the config files on the home partition were not erased completely (tried to keep files those seemed to be useful later so that I shouldn't reconfigure my programs).

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: software-center 13.10-0ubuntu4.1
ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Jun 10 07:29:04 2014
InstallationDate: Installed on 2014-04-20 (50 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
PackageArchitecture: all
SourcePackage: software-center
UpgradeStatus: No upgrade log present (probably fresh install)