This file is indexed.

/usr/lib/ubiquity/target-config/50gkd-caps is in gnome-keyring 3.18.3-0ubuntu2.1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh
set -e

# Make sure that the IPC_LOCK capability is added to the gnome-keyring-daemon
# binary after installation, since file system caps aren't supported by the
# LiveCD's squashfs.

PROGRAM=/usr/bin/gnome-keyring-daemon

if [ -e /target/sbin/setcap ] && [ -e /target/$PROGRAM ]; then
    if chroot /target setcap CAP_IPC_LOCK=ep $PROGRAM >/dev/null 2>&1; then
        logger --tag ubiquity "Setting capabilities for gnome-keyring-daemon using Linux Capabilities failed."
    fi
fi