$ sudo apt-get update
$ sudo apt-get install gkbd-capplet 

gkbd-capplet is installed in your system.

Make ensure the gkbd-capplet package were installed using the commands given below,

$ sudo dpkg-query -l | grep gkbd-capplet *

You will get with gkbd-capplet package name, version, architecture and description in a table

gkbd-capplet package basic information: