/usr/src/glibc/debian/debhelper.in/locales-all.postinst is in eglibc-source 2.19-0ubuntu6.
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 | #!/bin/sh
set -e
export LC_ALL=C
if [ "$1" = "configure" ]; then
# Remove existing locale-archive, otherwise they are prefered
# to the ones in this package
rm -f /usr/lib/locale/locale-archive 2>/dev/null || true
fi
#DEBHELPER#
exit 0
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