/usr/share/initramfs-tools/scripts/init-top/plymouth is in plymouth 0.8.2-2ubuntu30.
This file is owned by root:root, with mode 0o755.
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
OPTION=FRAMEBUFFER
PREREQ="framebuffer console_setup brltty"
prereqs()
{
echo "$PREREQ"
}
case $1 in
prereqs)
prereqs
exit 0
;;
esac
printf '\033[?25l' > /dev/tty7
/sbin/plymouthd --mode=boot --attach-to-session --pid-file=/run/initramfs/plymouth.pid
/bin/plymouth show-splash
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