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/usr/share/initramfs-tools/scripts/init-bottom/plymouth is in plymouth 0.8.8-0ubuntu17.

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

OPTION=FRAMEBUFFER
PREREQ="udev"

prereqs()
{
        echo "$PREREQ"
}

case $1 in
prereqs)
        prereqs
        exit 0
        ;;
esac

/bin/plymouth update-root-fs --new-root-dir=${rootmnt}