This file is indexed.

prerm is in libpam-gnome-keyring 3.10.1-1ubuntu4.4.

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 [ "$1" = remove ]; then
    pam-auth-update --package --remove gnome-keyring
fi