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[Andrew Martin <2009863@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

On Ubuntu 20.04 I was previously running Samba
2:4.13.17~dfsg-0ubuntu1.20.04.5 but today the upgrade to
2:4.15.13+dfsg-0ubuntu0.20.04.1 for USN-5936-1 appears to have
introduced the following regression when using winbind and libpam-
winbind to perform authentication:

PAM unable to dlopen(pam_winbind.so): /lib/security/pam_winbind.so: cannot open shared object file: No such file or directory
PAM adding faulty module: pam_winbind.so

The PAM configuration is as follows:

/etc/nsswitch.conf:
passwd:     files winbind
shadow:     files winbind
group:      files winbind

/etc/pam.d files configured with "pam-auth-update --force" and selecting
winbind as one of the enabled options.

Creating a symlink at /lib/security/pam_winbind.so that points at
/lib/x86_64-linux-gnu/security/pam_winbind.so does not resolve the
problem.

This appears to be the same issue described in #1644428 and #1584485. As
reported in those tickets, the upstream fix was introduced in 4.16 so it
seems that 4.15 is unusable with this patch applied.

** Affects: samba (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2009863

Title:
  Upgrade from Samba 4.13 to 4.15 results in "dlopen(pam_winbind.so):
  /lib/security/pam_winbind.so: cannot open shared object file: No such
  file or directory"

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