** Branch linked: lp:~nacc/ubuntu-seeds/ubuntu.yakkety-samba

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https://bugs.launchpad.net/bugs/1604630

Title:
  [FFe] 16.04 SAMBA missing winbind packages during install

Status in ubuntu-meta package in Ubuntu:
  Fix Released
Status in ubuntu-meta source package in Xenial:
  New

Bug description:
  Release Feature Freeze Exception justification: the Xenial samba-
  server task refers to a non-existent package (smbpass-winbind) which
  provided functionality that is necessary to be a functional samba
  server. That package has been replaced with libpam-winbind.

  [Impact]

   * Installing the 'samba file server' task results in a non-function
  installation due to not being able to access users/authentication
  against an AD server.

   * In 16.04, libpam-smbpass was removed and effectively replaced by
  libpam-winbind.

   * The seed still refers to the libpam-smbpass in 16.04, which is not
  an installable package.

   * While this bug does refer to both libpam-smbpass and libnss-
  winbind, the prior samba-server task does not install libnss-winbind
  (which was also available in trusty), so it's less clear that it is
  necessary for a generally functioning samba server.

  [Test Case]

   * Install the samba-server task and attempt to access AD-based
  functionality (auth). It will fail and libpam-winbind won't be
  installed.

  [Regression Potential]

   * Changing the seed should have low regression potential. Given that
  samba-server currently does not function properly (or at least as
  expected), this should only result in an additional package being
  installed (libpam-winbind) when choosing the samba-server task.

  When installing 16.04 server, checking "samba file server" during
  install the following packages are not installed by default:

  libnss-winbind
  libpam-winbind

  The effect is that while samba can join AD domains just fine, it
  cannot enumerate domain users, i.e. "sudo getent passwd" will show
  only local accounts, not domain accounts; also, an attempt to access a
  samba share will result in "access denied".  Specifically, the
  applicable log in /var/log/samba will have the lines:

  Kerberos ticket principal name is [<user>@<domain>]
  [2016/07/12 10:46:23.474798,  3] 
../source3/auth/user_krb5.c:164(get_user_from_kerberos_info)
    Username <domain>\<user> is invalid on this system

  Once the missing packages are installed and services are restarted
  (nmbd, smbd, winbind), the problem is resolved.  Installing these
  packages creates /lib/x86_64-linux-gnu/libnss_winbind.so.2, which is
  needed for winbind to enumerate the domain users/groups for
  credentials.

  In the distribution, checking "samba file server" should install the
  above listed packages or at least the release notes should specify
  that if this option is selected and one wishes to join an AD domain,
  then installing these packages is necessary.

  Thx.

  -ml

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: samba 2:4.3.9+dfsg-0ubuntu0.16.04.2
  ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13
  Uname: Linux 4.4.0-28-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  BothFailedConnect: Yes
  CurrentDesktop: LXDE
  Date: Tue Jul 19 17:35:16 2016
  NmbdLog:

  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SambaServerRegression: No
  SmbConfIncluded: Yes
  SmbLog:

  SourcePackage: samba
  UpgradeStatus: No upgrade log present (probably fresh install)

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