This file is indexed.

/usr/lib/ubiquity/target-config/31brltty is in brltty 4.3-1ubuntu5.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#! /bin/sh
set -e

[ ! -f /etc/default/brltty ] || . /etc/default/brltty

if egrep -q 'braille=ask|brltty' /proc/cmdline && [ -f /etc/brltty.conf ] && \
   [ -e /target/etc/default/brltty ] && [ "$RUN_BRLTTY" = yes ]; then
	mkdir -p /target/etc/default
	if [ -e /target/etc/brltty.conf ]; then
		mv /target/etc/brltty.conf /target/etc/brltty.conf.orig
	fi
	cp -a /etc/brltty.conf /target/etc/brltty.conf
	sed -i -e 's/^RUN_BRLTTY=.*/RUN_BRLTTY=yes/' /target/etc/default/brltty
fi

exit 0