preinst is in nvidia-settings 331.20-0ubuntu8.
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 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | #!/bin/sh
# preinst script for nvidia-settings
#
# see: dh_installdeb(1)
#
# Copyright (C) 2013 Canonical Ltd
# Authors: Alberto Milone
set -e
# summary of how this script can be called:
#        * <new-preinst> `install'
#        * <new-preinst> `install' <old-version>
#        * <new-preinst> `upgrade' <old-version>
#        * <old-preinst> `abort-upgrade' <new-version>
#
# For details see /usr/share/doc/packaging-manual/
case "$1" in
    install|upgrade)
    # Remove leftover from alternatives based nvidia-settings
    if [ -e /etc/alternatives/nvidia_settings_conf ]; then
        update-alternatives --quiet --remove-all nvidia_settings_conf || true
        rm -Rf /usr/lib/nvidia-settings
    fi
    ;;
    abort-upgrade)
    ;;
    *)
        echo "preinst called with unknown argument \`$1'" >&2
        exit 0
    ;;
esac
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