1:~$ modprobe -l | grep nv
/lib/modules/2.6.20-16-generic/volatile/nvidia.ko
/lib/modules/2.6.20-16-generic/volatile/nvidia_legacy.ko
/lib/modules/2.6.20-16-generic/volatile/nvidia_new.ko
/lib/modules/2.6.20-16-generic/kernel/drivers/ata/sata_nv.ko
/lib/modules/2.6.20-16-generic/kernel/drivers/char/nvram.ko
/lib/modules/2.6.20-16-generic/kernel/drivers/char/agp/nvidia-agp.ko
/lib/modules/2.6.20-16-generic/kernel/drivers/video/nvidia/nvidiafb.ko
                   :~$ modprobe -l | grep nvidia
/lib/modules/2.6.20-16-generic/volatile/nvidia.ko
/lib/modules/2.6.20-16-generic/volatile/nvidia_legacy.ko
/lib/modules/2.6.20-16-generic/volatile/nvidia_new.ko
/lib/modules/2.6.20-16-generic/kernel/drivers/char/agp/nvidia-agp.ko
/lib/modules/2.6.20-16-generic/kernel/drivers/video/nvidia/nvidiafb.ko
esto es el kernel que funciona