package samba 2:4.3.8+dfsg-0ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Tarek Eldeeb]

After upgrading to 16.04, samba did not launch. I purged and reinstalled but the post-installation script failed.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: samba 2:4.3.8+dfsg-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
BothFailedConnect: Yes
Date: Mon Apr 25 22:15:44 2016
DuplicateSignature:
 Setting up samba (2:4.3.8+dfsg-0ubuntu1) ...
 Job for smbd.service failed because the control process exited with error code. See "systemctl status smbd.service" and "journalctl -xe" for details.
 invoke-rc.d: initscript smbd, action "start" failed.
 dpkg: error processing package samba (--configure):
  subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2015-02-16 (434 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
JournalErrors: -- No entries --
NmbdLog:

RelatedPackageVersions:
 dpkg 1.18.4ubuntu1
 apt 1.2.10ubuntu1
SambaServerRegression: Yes
SmbConfIncluded: Yes
SmbLog:

SourcePackage: samba
Title: package samba 2:4.3.8+dfsg-0ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to xenial on 2016-04-23 (2 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Andreas Hasenack (ahasenack)]

You have an invalid value for the "share" parameter:

# testparm ./smb.conf
Load smb config files from ./smb.conf
rlimit_max: increasing rlimit_max (1024) to minimum Windows limit (16384)
WARNING: Ignoring invalid value 'share' for parameter 'security'
Error loading services.

It should be one of auto, domain, user or ads.