Locales cannot be installed in Kubuntu 11.04

[Tommy_CZ]

I tried to add czech language, but when I tried to use Kubuntu dialog in systemsettings, it says:
"Another application seems to be using the package system at this time. You must close all other package managers before you will be able to install or remove any packages."

But I do not have running any package manager nor apt in terminal etc.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: qapt-batch 1.1.1-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-8.41-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Mon Apr 11 14:27:03 2011
InstallationMedia: Kubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110330)
ProcEnviron:
 LANGUAGE=
 LANG=cs_CZ.UTF-8
 SHELL=/bin/bash
SourcePackage: qapt
UpgradeStatus: No upgrade log present (probably fresh install)

[Tommy_CZ (t-kijas)]

Another installation, same problem.