package samba4 4.0.0~alpha17~git20110807.dfsg1-1ubuntu1 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 1

[Tapas Mishra]

Was upgrading Ubuntu 11.04 to 11.10 on amd64 system when the upgrade failed.

ProblemType: Package
DistroRelease: Ubuntu 11.10
Package: samba4 4.0.0~alpha17~git20110807.dfsg1-1ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-13.52-generic 2.6.38.8
Uname: Linux 2.6.38-13-generic x86_64
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
Date: Sat Dec 24 08:45:20 2011
ErrorMessage: ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
SourcePackage: samba4
Title: package samba4 4.0.0~alpha17~git20110807.dfsg1-1ubuntu1 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to oneiric on 2011-12-23 (0 days ago)

[Tapas Mishra (mightydreams)]

user@home:~$ sudo dpkg --configure -a

[sudo] password for user:
Setting up samba4 (4.0.0~alpha17~git20110807.dfsg1-1ubuntu1) ...
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"
module samba_dsdb initialization failed : No such object
Unable to load modules for /var/lib/samba/private/sam.ldb: dsdb_module_search_dn: did not find base dn @ROOTDSE (0 results)
Traceback (most recent call last):
  File "/usr/share/samba/setup/upgradeprovision", line 1716, in <module>
    ldbs = get_ldbs(paths, creds, session, lp)
  File "/usr/lib/pymodules/python2.7/samba/upgradehelpers.py", line 156, in get_ldbs
    ldbs.sam = SamDB(paths.samdb, session_info=session, credentials=creds, lp=lp, options=["modules:samba_dsdb"])
  File "/usr/lib/pymodules/python2.7/samba/samdb.py", line 55, in __init__
    options=options)
  File "/usr/lib/pymodules/python2.7/samba/__init__.py", line 114, in __init__
    self.connect(url, flags, options)
  File "/usr/lib/pymodules/python2.7/samba/samdb.py", line 69, in connect
    options=options)
_ldb.LdbError: (80, 'dsdb_module_search_dn: did not find base dn @ROOTDSE (0 results)')
dpkg: error processing samba4 (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 samba4