$ dpkg-reconfigure keyboard-configuration $ cat /etc/default/keyboard $ setxkbmap ch
$ cat /usr/share/doc/keyboard-configuration/README.Debian After modifying /etc/default/keyboard, you can apply the changes to the Linux console by running setupcon. If X is configured to use that file too, then the changes will become visible to X only if udevadm trigger --subsystem-match=input --action=change is called, or the system is rebooted.