مشکل با نصب KDE در Cent OS 6.2

[mehrdad1991h]

سلام
تو لینوکس هیچ کودوم اینا نصب نمیشه
اینم ارور

[root@localhost ~]# yum groupinstall "GNOME Desktop Environment"
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
 * base: mirror.nsc.liu.se
 * extras: centosh2.centos.org
 * updates: mirror.nsc.liu.se
Setting up Group Process
Checking for new repos for mirrors
Warning: Group GNOME Desktop Environment does not exist.
No packages in any requested group available to install or update

[root@localhost ~]# yum groupinstall "KDE (K Desktop Environment)"
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
 * base: mirror.nsc.liu.se
 * extras: centosh2.centos.org
 * updates: mirror.nsc.liu.se
Setting up Group Process
Checking for new repos for mirrors
Warning: Group KDE (K Desktop Environment) does not exist.
No packages in any requested group available to install or update

or

[root@localhost ~]# yum groupinstall "X Window System" "KDE (K Desktop Environment)"
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
 * base: mirror.nsc.liu.se
 * extras: centosh2.centos.org
 * updates: mirror.nsc.liu.se
Setting up Group Process
Checking for new repos for mirrors
Package xorg-x11-server-Xorg-1.10.4-6.el6_2.1.0.1.centos.i686 already installed and latest version
Package xorg-x11-xinit-1.0.9-13.el6.i686 already installed and latest version
Package 1:xorg-x11-xauth-1.0.2-7.1.el6.i686 already installed and latest version
Package xorg-x11-drivers-7.3-13.3.el6.i686 already installed and latest version
Package wdaemon-0.17-2.el6.i686 already installed and latest version
Package xorg-x11-server-utils-7.5-5.2.el6.i686 already installed and latest version
Package hal-0.5.14-11.el6.i686 already installed and latest version
Package plymouth-system-theme-0.8.3-24.el6.centos.noarch already installed and latest version
Package xorg-x11-utils-7.4-8.el6.i686 already installed and latest version
Package wacomexpresskeys-0.4.2-3.el6.i686 already installed and latest version
Package spice-vdagent-0.8.1-3.el6.i686 already installed and latest version
Package firstboot-1.110.11-1.el6.i686 already installed and latest version
Package glx-utils-7.11-3.el6.i686 already installed and latest version
Package xvattr-1.3-18.el6.i686 already installed and latest version
Warning: Group x11 does not have any packages.
Warning: Group KDE (K Desktop Environment) does not exist.
No packages in any requested group available to install or update
[root@localhost ~]# yum groupinstall "X Window System"
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
 * base: mirror.nsc.liu.se
 * extras: centosh2.centos.org
 * updates: mirror.nsc.liu.se
Setting up Group Process
Checking for new repos for mirrors
Package xorg-x11-server-Xorg-1.10.4-6.el6_2.1.0.1.centos.i686 already installed and latest version
Package xorg-x11-xinit-1.0.9-13.el6.i686 already installed and latest version
Package 1:xorg-x11-xauth-1.0.2-7.1.el6.i686 already installed and latest version
Package xorg-x11-drivers-7.3-13.3.el6.i686 already installed and latest version
Package wdaemon-0.17-2.el6.i686 already installed and latest version
Package xorg-x11-server-utils-7.5-5.2.el6.i686 already installed and latest version
Package hal-0.5.14-11.el6.i686 already installed and latest version
Package plymouth-system-theme-0.8.3-24.el6.centos.noarch already installed and latest version
Package xorg-x11-utils-7.4-8.el6.i686 already installed and latest version
Package wacomexpresskeys-0.4.2-3.el6.i686 already installed and latest version
Package spice-vdagent-0.8.1-3.el6.i686 already installed and latest version
Package firstboot-1.110.11-1.el6.i686 already installed and latest version
Package glx-utils-7.11-3.el6.i686 already installed and latest version
Package xvattr-1.3-18.el6.i686 already installed and latest version
Warning: Group x11 does not have any packages.
No packages in any requested group available to install or update

چه کنم ؟