Darthmod's installer doesn't put preference.script.txt and user.script.txt in the right place. You will have to manually copy the two files to the c: drive prefix inside your steamapps install. Roughly here. /.steam/debian-installation/steamapps/compatdata/.../pfx/drive_c/users/steamuser/AppData/Roaming/The Creative Assembly/Napoleon/scripts. Mod was installed using wine and manually changing the install location.