Eu encontrei a solução no link
Em /etc/pam.d/common-password
#
# /etc/pam.d/common-password - password-related modules common to all services
# -- removed comment header talking about various options --
# here are the per-package modules (the "Primary" block)
password [success=2 default=ignore] pam_unix.so obscure sha512
password [success=1 user_unknown=ignore default=die] pam_ldap.so use_authtok try_first_pass
# here's the fallback if no module succeeds
password requisite pam_deny.so
# prime the stack with a positive return value if there isn't one already;
# this avoids us returning an error just because nothing sets a success code
# since the modules above will each just jump around
password required pam_permit.so
# and here are more per-package modules (the "Additional" block)
password optional pam_gnome_keyring.so
# end of pam-auth-update config
Tente remover o parâmetro use_authtok e salve o arquivo. Talvez seja necessário reiniciar.
-Tim
Funciona! Tee hee