/usr/share/ltsp/plugins/ltsp-build-client/Debian/030-loopback is in ltsp-server 5.5.7-1.
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 13 | case "$MODE" in
finalization)
# create default loopback entry
cat <<EOF > $ROOT/etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
EOF
;;
esac
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