/etc/pam.d/lightdm-remote-freerdp is in lightdm-remote-session-freerdp 1.0-0ubuntu2.
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 | #%PAM-1.0
auth requisite pam_nologin.so
auth required pam_env.so readenv=1
auth required pam_env.so readenv=1 envfile=/etc/default/locale
auth required pam_freerdp.so
session required pam_limits.so
session required pam_freerdp.so
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