/usr/share/live/build/hooks/normal/0040-create-locales-files.hook.chroot is in open-infrastructure-system-build 20161101-lts2-2.
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 | #!/bin/sh
set -e
# Create /etc/environment and /etc/default/locale
touch /etc/environment
touch /etc/default/locale
|