[Samba] SAMBA4 BDC PROBLEM

[wael]

good day

i have samba4 work well as PDC in cent os
i want to configure  samba4 as BDC on ubuntu
so i try to follow this tutorial

https://wiki.samba.org/index.php/Samba4/HOWTO/Join_a_domain_as_a_DC

but this commande : # kinit administrator
give me this errors:
  kinit: Improper format of Kerberos configuration file while 
initializing Kerberos 5 library



can any one help me
thanks