http://qref.sourceforge.net/Debian/reference/ch-tips.es.html#s-booting
In spanish translation section 8.1.1 "¡Olvidé la contraseña de superusuario!" (1):
"
init-2.03# mount -n -t remount,rw /
"
-t option is bad the correct is:
"
init-2.03# mount -no remount,rw /
"
PD: the english version is OK