I changed in setting under sudo nano /etc/default/keyboard XKBLAYOUT="in"
I know i made some mistakes here "in" is not any standard but after rebooting my system am unable to login in my device please help me out.
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How are you trying to login, via your keyboard connected to the device or via a shell?
If you have ssh running on the Pi and it is connected to your home internet connection, then log into your routers page (usually something like 192.168.1.1) and find the IP# that has been assigned to the RPi.
You can then see if the ssh service is started - try ssh pi@ (Assuming pi is your login). If you get a shell, try your password and hopefully you can log in. You should then be able to edit the keyboard configuration and re-start the Pi.