Turn on the keypad by default on Linux boot

Linux default boot does not turn on the numeric keypad numberlock, each time the input power-on password also have to bother to light their own lights, so that the lights on automatically lit, need a software to line, is Numlockx, can be installed through Yum:
Yuminstall-ynumlockx
After installation, the following statements can be written in/etc/rc.local:
If[-x/usr/bin/numlockx];then
/usr/bin/numlockxon
Fi
Here, we write directly: Numlockx can also, because in the terminal run this sentence will open the keypad. But there is no such file in Ubuntu, the solution is as follows: after loading the Numlockx, the edited file is changed down
sudo gedit/usr/share/lightdm.conf.d/50-unity-greeter.conf

Finally add the following code:
Greeter-setup-script=/usr/bin/numlockx on

Turn on the keypad by default on Linux boot