/etc/pam.d/lightdm-greeter is in lightdm 1.26.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | #%PAM-1.0
auth required pam_permit.so
auth optional pam_gnome_keyring.so
auth optional pam_kwallet.so
auth optional pam_kwallet5.so
@include common-account
session [success=ok ignore=ignore module_unknown=ignore default=bad] pam_selinux.so close
session required pam_limits.so
@include common-session
session [success=ok ignore=ignore module_unknown=ignore default=bad] pam_selinux.so open
session optional pam_gnome_keyring.so auto_start
session optional pam_kwallet.so auto_start
session optional pam_kwallet5.so auto_start
session required pam_env.so readenv=1
session required pam_env.so readenv=1 user_readenv=1 envfile=/etc/default/locale
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