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/etc/freeradius/3.0/mods-available/chap is in freeradius-config 3.0.16+dfsg-1ubuntu3.

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# -*- text -*-
#
#  $Id: e2a3cd3b110ffffdbcff86c7fc65a9275ddc3379 $

# CHAP module
#
#  To authenticate requests containing a CHAP-Password attribute.
#
chap {
	# no configuration
}