/usr/src/glibc/debian/debhelper.in/locales-all.prerm is in eglibc-source 2.15-0ubuntu10.
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 14 15 16 17 18 | #!/bin/sh
set -e
case "$1" in
remove|purge)
# Is locales installed?
if [ -x /usr/sbin/locale-gen ] ; then
# If yes, generate locales selected in the debconf question
locale-gen
fi
;;
*)
;;
esac
#DEBHELPER#
exit 0
|