/etc/pam.d/radiusd is in freeradius 2.1.12+dfsg-1.2ubuntu8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# /etc/pam.d/radiusd - PAM configuration for FreeRADIUS
#
# We fall back to the system default in /etc/pam.d/common-*
#
@include common-auth
@include common-account
@include common-password
@include common-session
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