Numlock turned on on boot-up

From the man page: "numlockx is a program to control the NumLock key inside X11 session scripts." It's a very simple tool. You invoke it from the commandline or a script

$ numlockx on

will enable numlock and

$ numlockx off

will disable it.

I use it with xfce myself as an autostarted application. Once you have installed the package, go to "Settings->Session and Startup" from the xfce menu. Click on the "Application Autostart" tab, and then on the Add button. Enter whatever you like in the Name and Description boxes and in the Command box, enter "numlockx on" (without the quotes). Click OK and Close, and the next time you login, you'll have your numlock on.

You will have to try searching in your BIOS, if you do not want to do that then you can try numlockx, it is available in the repositories.