проблема с samba4 после установки

Я новичок в Linux. Я недавно установил samba4 в Ubuntu 13.04, но у него возникла ошибка после установки

bobby@bobby-Aspire-4732Z:~$ sudo apt-get install samba4
Reading package lists... Done
Building dependency tree       
Reading state information... Done
samba4 is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue [Y/n]? y
Setting up 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 processing samba4 (--configure):
subprocess installed post-installation script returned error exit status 255
Errors were encountered while processing:
samba4
E: Sub-process /usr/bin/dpkg returned an error code (1)
bobby@bobby-Aspire-4732Z:~$

Кто-нибудь когда-либо сталкивался с этим раньше, и могу ли я предложить ваше объяснение. Спасибо прежде.

С уважением, Бобби