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[BobD <1371710@xxxxxxxxxxxxxxxxxx>]

By the way, this doesn't appear to be documented. IMO the existence of
the pam-autologin service vs the pam-greeter service ought to be
documented, as well as this behavior of setting PAM_USER in the pam-
autologin service.

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https://bugs.launchpad.net/bugs/1371710

Title:
  autologin should support PAM_USER

Status in Light Display Manager:
  Triaged
Status in Light Display Manager 1.10 series:
  Triaged
Status in “lightdm” package in Ubuntu:
  Triaged
Status in “lightdm” source package in Trusty:
  Triaged
Status in “lightdm” source package in Utopic:
  Triaged

Bug description:
  There should be a way to specify the autologin-user via PAM_USER.

  Currently, to enable autologin you specify autologin-user in the
  lightdm.conf file, and any value of PAM_USER returned after
  pam_authenticate() is ignored.

  This means if you want to affect autologin so that different users are
  logged in at different times, based on some external criteria, you
  must rewrite the lightdm configuration and restart the service each
  time.

  One approach would be to add a new key e.g. "autologin-user-pam=true"
  which would enable autologin and use the PAM_USER returned by
  pam_authenticate() as the user to log in. It might make sense that if
  PAM_USER is *not* set by the call to pam_authenticate to fall back to
  the autologin-user value, or else to disable autologin entirely.

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