This file is indexed.

/usr/share/plymouth/themes/kubuntu-logo/kubuntu-logo.grub is in plymouth-theme-kubuntu-logo 1:18.04ubuntu11.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#set_background_image "images/tile.png";

set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
if background_color 0,0,0; then
  clear
fi