Configurando samba4 (4.0.3+dfsg1-0.1ubuntu1) ...
ERROR(<type 'exceptions.ValueError'>): uncaught exception - unable to parse dn string
  File "/usr/lib/python2.7/dist-packages/samba/netcmd/__init__.py", line 175, in _run
    return self.run(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/samba/netcmd/dbcheck.py", line 108, in run
    fix=fix, yes=yes, quiet=quiet, in_transaction=started_transaction)
  File "/usr/lib/python2.7/dist-packages/samba/dbchecker.py", line 58, in __init__
    self.infrastructure_dn = ldb.Dn(samdb, "CN=Infrastructure," + samdb.domain_dn())
dpkg: error al procesar samba4 (--configure):
 el subproceso instalado el script post-installation devolvió el código de salida de error 255