Problema ao mudar de senha

Se ao mudar de senha, aparecer o seguinte erro:

llx@pcapg76:~$ passwd                                                 
Enter login(LDAP) password:                                           
passwd: User not known to the underlying authentication module        
passwd: password unchanged

Alterar arquivo

/etc/pam.d/common-password

Mudando para a seguinte ordem:

password        sufficient      pam_ldap.so
password   required   pam_unix.so nullok obscure md5

Arquivo /etc/pam.d/common-account

account sufficient      pam_unix.so
account required        pam_ldap.so