/usr/lib/tcltk/graphviz/pkgIndex.tcl is in libgv-tcl 2.36.0-0ubuntu3.
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 | package ifneeded Tcldot 2.36.0 "
load [file join $dir libtcldot.so.0] Tcldot"
package ifneeded Tclpathplan 2.36.0 "
load [file join $dir libtclplan.so.0] Tclpathplan"
package ifneeded Gdtclft 2.36.0 "
load [file join $dir libgdtclft.so.0] Gdtclft"
package ifneeded gv 0 "
load [file join $dir libgv_tcl.so] gv"
package ifneeded Tkspline 2.36.0 "
package require Tk 8.3
load [file join $dir libtkspline.so.0] Tkspline"
# end
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