This file is indexed.

/usr/lib/x86_64-linux-gnu/ibis1.5.7/pkgIndex.tcl is in libibdm1 1.5.7-1ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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proc ibis_load1.5.7 {dir} {
   puts "Loading package ibis from: $dir"
   uplevel \#0 load [file join $dir libibis.so.1.5.7]
}

package ifneeded ibis 1.5.7 [list ibis_load1.5.7 $dir]