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[Thomas Bushnell BSG <921315@xxxxxxxxxxxxxxxxxx>]

By the way, this bug is quite new. With our configuration, in December,
it worked just fine, as far as I can tell.

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https://bugs.launchpad.net/bugs/921315

Title:
  lightdm greeter provides no access to pam accounts

Status in “lightdm” package in Ubuntu:
  New

Bug description:
  In our configuration, nearly all users are granted access to the
  system via pam. The User Accounts dialog in Settings shows only a
  single user which was created at install time...and I'm not sure where
  from, because we preseed "d-i passwd/make-user boolean false" to try
  and inhibit the initial user account.

  We control access with pam_krb5 in common-auth, and pam_access in
  common-account, and we want all users passed by that method to be able
  to log in (and pam_access is using netgroups to decide which users
  should be permitted).

  So, in this world, I have one account known to the Accounts Manager,
  and it's the only one which lightdm will let me use: I get no "other
  user" dialog of any kind. This is a serious bug.

  We have the standard unity-greeter.conf and access.conf in
  /etc/lightdm (though the latter is supposedly unused). Our
  lightdm.conf contains this:

  [SeatDefaults]
  greeter-session=unity-greeter
  user-session=ubuntu
  allow-guest=false
  autologin-user=

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