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/usr/share/X11/xkb/rules/xfree98 is in xkb-data 2.5-1ubuntu1.

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The actual contents of the file can be viewed below.

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//
//  Rules for resolving XKB components for use with XFree86
//  Copyright 1996 by Joseph Moss
//

! model 	=	keycodes	geometry
  pc98		=	xfree98(pc98)	nec(pc98)
  jp106		=	xfree98(jp106)	pc(jp106)

! model		layout		=	symbols
  pc98		nec_vndr/jp	=	nec_vndr/jp(pc98)
  jp106		jp		=	jp

! model		layout	=	compat		types
  *		*	=	complete	complete

! option		=	symbols
  grp:switch		=	+group(switch)
  grp:toggle		=	+group(toggle)
  grp:shift_toggle	=	+group(shifts_toggle)
  grp:ctrl_shift_toggle	=	+group(ctrl_shift_toggle)
  grp:ctrl_alt_toggle	=	+group(ctrl_alt_toggle)
  ctrl:nocaps		=	+ctrl(nocaps)
  ctrl:lctrl_meta	=	+ctrl(lctrl_meta)
  ctrl:swapcaps		=	+ctrl(swapcaps)
  ctrl:ctrl_ac		=	+ctrl(ctrl_ac)
  ctrl:ctrl_aa		=	+ctrl(ctrl_aa)