[Bug 1644428] Re: Unable to log in with AD account after update

[Michael Iatrou]

The same issue is observed on Xenial:

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.2 LTS
Release:        16.04
Codename:       xenial

ii  libpam-gnome-keyring:amd64   3.18.3-0ubuntu2                   amd64   
ii  libpam-modules:amd64         1.1.8-3.2ubuntu2                  amd64   
ii  libpam-modules-bin           1.1.8-3.2ubuntu2                  amd64               
ii  libpam-pwquality:amd64       1.3.0-0ubuntu1                    amd64   
ii  libpam-runtime               1.1.8-3.2ubuntu2                  all     
ii  libpam-sss:amd64             1.13.4-1ubuntu1.2                 amd64   
ii  libpam-systemd:amd64         229-4ubuntu16                     amd64   
ii  libpam0g:amd64               1.1.8-3.2ubuntu2                  amd64   
ii  python-samba                 2:4.3.11+dfsg-0ubuntu0.16.04.3    amd64   
ii  samba                        2:4.3.11+dfsg-0ubuntu0.16.04.3    amd64   
ii  samba-common                 2:4.3.11+dfsg-0ubuntu0.16.04.3    all     
ii  samba-common-bin             2:4.3.11+dfsg-0ubuntu0.16.04.3    amd64                
ii  samba-dsdb-modules           2:4.3.11+dfsg-0ubuntu0.16.04.3    amd64   
ii  samba-libs:amd64             2:4.3.11+dfsg-0ubuntu0.16.04.3    amd64   
ii  samba-vfs-modules            2:4.3.11+dfsg-0ubuntu0.16.04.3    amd64

>From /var/log/auth.log:
10:48:56 gcc-ubuntu-tst1 sudo:      gcc : problem with defaults entries ; TTY=pts/18 ; PWD=/etc/sssd ;
10:48:56 gcc-ubuntu-tst1 sudo: PAM unable to dlopen(pam_winbind.so): /lib/security/pam_winbind.so: cannot open shared object file: No such file or directory
10:48:56 gcc-ubuntu-tst1 sudo: PAM adding faulty module: pam_winbind.so
10:48:56 gcc-ubuntu-tst1 sudo:      gcc : TTY=pts/18 ; PWD=/etc/sssd ; USER=root ; COMMAND=/bin/more sssd.conf
10:48:56 gcc-ubuntu-tst1 sudo: pam_unix(sudo:session): session opened for user root by gcc(uid=0)
10:48:56 gcc-ubuntu-tst1 sudo: pam_unix(sudo:session): session closed for user root

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https://bugs.launchpad.net/bugs/1644428

Title:
  Unable to log in with AD account after update

Status in samba package in Ubuntu:
  Confirmed
Status in samba source package in Trusty:
  Fix Released

Bug description:
  After performing a system update one of my users was no longer able to
  authenticate against Active Directory. This is on a Ubuntu 14.04 on
  amd64.

  The error in /var/log/auth.log was:

  Nov 24 15:08:06 haggerstone lightdm: PAM unable to
  dlopen(pam_winbind.so): /lib/security/pam_winbind.so: cannot open
  shared object file: No such file or directory

  I tried rebooting thinking something broke during the update, but I
  got the same error.

  I checked against my PC and saw that there were updates pending for
  the samba packages. I used the version numbers on my PC to perform a
  downgrade to 2:4.3.11+dfsg-0ubuntu0.14.04.1 and the problem went away.

  The affected version is 2:4.3.11+dfsg-0ubuntu0.14.04.2

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