All of the configuration for the keyboard is performed within the main Xorg config file. As root, load /etc/X11/xorg.conf into your favorite text editor and look for the keyboard section. You want it to look more like this:

Section "InputDevice"
   Identifier      "Logitech Elite Keyboard"
   Driver          "keyboard"
   Option          "CoreKeyboard"
   Option          "XkbRules"      "xorg"
   Option          "XkbModel"      "logiinkseusb"
   Option          "XkbLayout"     "us"
   Option          "XkbVariant"    "intl"
EndSection

The logiinkseusb is not strictly the exact map for this keyboard, but it is awfully close and it is included in Xorg, so there is no need to start editing complicated xkb files. You will want to change the XkbLayout option to the correct country code for your keyboard.
Restart X and you should be able to map all the buttons on your keyboard with the correct names, using something like Gnome's Keyboard Shortcuts preferences item
Kindly taken from the following Howto