preinst is in klibc-utils 2.0.4-8ubuntu1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | #!/bin/sh -e
if [ "$1" != upgrade ] || dpkg --compare-versions "$2" lt 2.0.4-8~; then
# Disable the klibc hook installed by older versions of initramfs-tools
dpkg-divert --package klibc-utils --add --rename \
--divert /usr/share/initramfs-tools/hooks/klibc^i-t \
/usr/share/initramfs-tools/hooks/klibc
fi
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