prerm is in nvidia-settings 295.33-0ubuntu1.
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 15 16 17 18 19 20 | #!/bin/sh
# prerm script for nvidia-settings
#
# Copyright (C) 2011 Canonical Ltd
# Authors: Alberto Milone
PACKAGE_NAME=nvidia-settings
case "$1" in
	remove)
		update-alternatives --remove nvidia_setting_conf /usr/lib/nvidia-settings/ld.so.conf
		# Trigger gmenu so as to update the gnome menu
		dpkg-trigger --by-package=$PACKAGE_NAME gmenucache || true
		# explicit ldconfig due to alternatives
		ldconfig
	;;
esac
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