Package: xserver-xorg Version: 1:7.3+18 If I use LANG=C, then postinst complains: xserver-xorg postinst warning: failed to infer keyboard layout from layout/lang '10 debian-installer/keymap doesn't exist--C' Not defining a foreign language should not trigger suspicious warnings (IMHO). I would suggest to drop this warning, and silently go with the default keyboard layout. Best wishes for the new year Harri