Ubuntu 13.10: keyboard mapping issues

sometime my keyboard mappings has been changed to US from Japanse..
I am not sure the trigger..

anyway, try followings

These command might solve this kind of issues.

- on GUI

# setxkbmap jp

# setxkbmap jp -print | xkbcomp - $DISPLAY

- dump keycode mapping

# xmodmap -pke > .Xmodmap

then modify Xmodmap file

- edit the following file

# vi /etc/default/keyboard 

- dpkg-reconfigure command

# dpkg-reconfigure console-setup

# dpkg-reconfigure keyboard-configuration