Use Menu->Preferences->Keyboard. Select the Layout Tab, and click on the button listing the model. (This is via the MATE desktop, by the way. It shouldn't be too different on the others.)
If your keyboard is not listed, you will probably have to use the Generic ketboard layout. (For example, the Magitronic FK-5001 I am using does not have a listing, so I have to use the generic 105-key layout).
They say that a three-year old can use Windows 8. I say that's a bit of a regression. When I was three, I could use DOS.
A computer without Windows is like a fish without a bicycle.