samba error

sudojonathan@mercury:~$ sudo apt-get install samba4
[sudo] password for jonathan:
Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
  bind9 phpldapadmin samba-gtk swat2
Recommended packages:
  samba4-dsdb-modules
The following NEW packages will be installed:
  samba4
0 upgraded, 1 newly installed, 0 to remove and 4 not upgraded.
Need to get 0 B/1,609 kB of archives.
After this operation, 11.5 MB of additional disk space will be used.
Preconfiguring packages ...
Selecting previously deselected package samba4.
(Reading database ... 194207 files and directories currently installed.)
Unpacking samba4 (from .../samba4_4.0.0~alpha17~git20110807.dfsg1-1ubuntu1_i386.deb) ...
Processing triggers for man-db ...
Processing triggers for ureadahead ...
ureadahead will be reprofiled on next reboot
Setting up samba4 (4.0.0~alpha17~git20110807.dfsg1-1ubuntu1) ...
Administrator password will be set randomly!
Unknown parameter encountered: "max log size"
Ignoring unknown parameter "max log size"
Unknown parameter encountered: "syslog"
Ignoring unknown parameter "syslog"
Unknown parameter encountered: "passdb backend"
Ignoring unknown parameter "passdb backend"
Unknown parameter encountered: "unix password sync"
Ignoring unknown parameter "unix password sync"
Unknown parameter encountered: "passwd program"
Ignoring unknown parameter "passwd program"
Unknown parameter encountered: "pam password change"
Ignoring unknown parameter "pam password change"
Unknown parameter encountered: "map to guest"
Ignoring unknown parameter "map to guest"
Unknown parameter encountered: "usershare allow guests"
Ignoring unknown parameter "usershare allow guests"
Unknown parameter encountered: "guest ok"
Ignoring unknown parameter "guest ok"
Unknown parameter encountered: "guest ok"
Ignoring unknown parameter "guest ok"
Unknown parameter encountered: "max log size"
Ignoring unknown parameter "max log size"
Unknown parameter encountered: "syslog"
Ignoring unknown parameter "syslog"
Unknown parameter encountered: "passdb backend"
Ignoring unknown parameter "passdb backend"
Unknown parameter encountered: "unix password sync"
Ignoring unknown parameter "unix password sync"
Unknown parameter encountered: "passwd program"
Ignoring unknown parameter "passwd program"
Unknown parameter encountered: "pam password change"
Ignoring unknown parameter "pam password change"
Unknown parameter encountered: "map to guest"
Ignoring unknown parameter "map to guest"
Unknown parameter encountered: "usershare allow guests"
Ignoring unknown parameter "usershare allow guests"
Unknown parameter encountered: "guest ok"
Ignoring unknown parameter "guest ok"
Unknown parameter encountered: "guest ok"
Ignoring unknown parameter "guest ok"
ProvisioningError: guess_names: 'realm =' was not specified in supplied /etc/samba/smb.conf.  Please remove the smb.conf file and let provision generate it
dpkg: error processing samba4 (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 samba4
E: Sub-process /usr/bin/dpkg returned an error code (1)