preinst is in lightdm-gtk-greeter 1.1.5-0ubuntu1.
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 9 10 11 12 13 14 | #!/bin/sh
set -e
if dpkg-maintscript-helper supports mv_conffile; then
dpkg-maintscript-helper mv_conffile \
/etc/lightdm/lightdm-gtk-greeter.conf \
/etc/lightdm/lightdm-gtk-greeter-ubuntu.conf \
1.0.0-0ubuntu1 -- "$@"
fi
exit 0
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