Nvidia module fails to load on Kubuntu 13.04 Raring Ringtail

I tried to install the nvidia drivers from "additional drivers" (jockey-kde) or manually, and the nvidia drivres fail to load. The system always loads the Nouveau driver. Also, the nvidia-settings icon does not appear in the launcher menu. If I run nvidia-settings manually, I get this message:
You do not appear to be using the NVIDIA X driver. Please edit your X configuration file (just run `nvidia-xconfig` as root), and restart the X server.

If manually install the driver I get this in the terminal:
(Leyendo la base de datos ... 169259 ficheros o directorios instalados actualmente.)
Preparando para reemplazar nvidia-313-updates 313.30-0ubuntu1 (usando nvidia-313-updates_313.30-0ubuntu1_amd64.deb) ...
Removing all DKMS Modules
Done.
Desempaquetando el reemplazo de nvidia-313-updates ...
Preparando para reemplazar nvidia-settings-313-updates 313.30-0ubuntu1 (usando nvidia-settings-313-updates_313.30-0ubuntu1_amd64.deb) ...
Desempaquetando el reemplazo de nvidia-settings-313-updates ...
Configurando nvidia-313-updates (313.30-0ubuntu1) ...
INFO:Enable nvidia-313-updates
DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/dell_latitude
DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/lenovo_thinkpad
DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/put_your_quirks_here
Loading new nvidia-313-updates-313.30 DKMS files...
Building only for 3.8.0-21-generic
Building for architecture x86_64
Building initial module for 3.8.0-21-generic
Done.

nvidia_313_updates:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/3.8.0-21-generic/updates/dkms/

depmod....

DKMS: install completed.
Configurando nvidia-settings-313-updates (313.30-0ubuntu1) ...
Procesando disparadores para man-db ...

I've tried with the versions 304, 313 and 319 from the Xorg Edgers PPA repository. I've tried with Ubuntu 13.04 kernels, and the mainline 3.9. I get the same problem with all combinations.

Originally I had installed the system with my monitor connected to my intel iGPU using the intel drivers. Now I have the monitor connected to the Nvidia card, and as I said before with nouveau works well.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: nvidia-313-updates 313.30-0ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-21.32-generic 3.8.8
Uname: Linux 3.8.0-21-generic x86_64
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
Date: Mon May 20 17:01:42 2013
InstallationDate: Installed on 2013-04-08 (42 days ago)
InstallationMedia: Kubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130407)
MarkForUpload: True
ProcEnviron:
 LANGUAGE=es_AR:es
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=es_AR.UTF-8
 SHELL=/bin/bash
SourcePackage: nvidia-graphics-drivers-313-updates
UpgradeStatus: No upgrade log present (probably fresh install)