/usr/share/freeradius/dictionary.jradius is in freeradius-common 2.2.8+dfsg-0.1ubuntu0.1.
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 16 17 18 19  | # -*- text -*-
# Copyright (C) 2011 The FreeRADIUS Server project and contributors
##############################################################################
#
#	jradius VSAs.  See http://jradius.org
#
#	$Id$
#
##############################################################################
VENDOR		JRadius				19211
BEGIN-VENDOR	JRadius
ATTRIBUTE	JRadius-Request-Id			1	string
ATTRIBUTE	JRadius-Session-Id			2	string
ATTRIBUTE	JRadius-Proxy-Client			3	octets
END-VENDOR	JRadius
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