DSL Embedded :: cannot change keyboard layout

I did HD install, then installed XFree86 through apt-get. Here is my "/etc/X11/XF86Config-4":
Section "InputDevice"
      Identifier      "Generic Keyboard"
      Driver          "keyboard"
      Option          "CoreKeyboard"
      Option          "XkbRules"      "xfree86"
      Option          "XkbModel"      "pc102"
      Option          "XkbLayout"     "lt"
      Option          "XkbOptions"    "grp:shift_toggle"

But I still have "us" layout :-(

"setxkbmap -option grp:alt_shift_toggle lt" and
"setxkbmap -option grp:alt_shift_toggle us,lt" answers

Couldn't interpret _XKB_RULES_NAMES property
Use defaults: rules - 'xfree86' model - 'pc101' layout - 'us'
Segmentation fault

original here.