/usr/share/livecd-rootfs/live-build/ubuntu-touch/hooks/99-remove-lists.binary is in livecd-rootfs 2.525.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | #!/bin/sh
# remove-lists: Remove all apt lists for space as our apport does not need them
#
# Author: Łukasz 'sil2100' Zemczak <achiang@canonical.com>
# Date : September 22, 2015
echo "Removing /var/lib/apt/lists/* from the binary"
find binary/boot/filesystem.dir/var/lib/apt/lists/ -type f | xargs rm -f
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