I found this How to enable numlock at boot time for login screen?
But after I performed this steps (luvr answer from Apr 29 '12 at 20:11 ):
Ensure that numlockx is installed:
sudo apt-get install numlockx
Edit the file /etc/lightdm/lightdm.conf
gksudo gedit /etc/lightdm/lightdm.conf
Add the following line to the file:
after theese steps I rebooted the PC, and I can no longer be run ubuntu.
Why ubuntu drastically limits the system setup options. Through the GUI and deny basic settings such as on Num Lock on the log screen. And user must look for different solutions which can damages their system.
Thank you community very much :(