Evidently, "da" is not recognized. (The debbie desktop application just takes over from Maemo, so doesn't need this.) In LXDE, try "dano" (for Danish/Norwegian) or "nordic" (for Danish/Norwegian/Finnish/Swedish), those assignments exist on the Maemo side, while there is no "da" keymap in Maemo's rx51 file. EDIT: I've collected all keymap labels from /usr/share/X11/xkb/symbols/nokia_vndr/rx-51 and listed them in the wiki instructions for localization.