This file is indexed.

prerm is in plymouth-theme-glow 0.8.8-0ubuntu17.

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.

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#!/bin/sh

set -e

if [ "x$1" = xremove ]; then
	update-alternatives \
		--remove default.plymouth /lib/plymouth/themes/glow/glow.plymouth
fi