A portion of /etc/grub.d/05_debian_theme in grub-pc 1.98+20100804-11 has:
# Earlier versions of grub-pc copied the default background image to
/boot/grub
# during postinst. Remove those obsolete images if they haven't been touched
by
# the user. They are still available under /usr/share/images/desktop-base/ if
# desktop-base is installed.
while read checksum background; do
if [ -f "${background}" ] && [ "x`sha1sum "${background}"`" =
"x${checksum} ${
background}" ]; then
echo "Removing old background image: ${background}" >&2
rm "${background}"
fi
done <<EOF
648ee65dd0c157a69b019a5372cbcfea4fc754a5
debian-blueish-wallpaper-640x480.png
0431e97a6c661084c59676c4baeeb8c2f602edb8
debian-blueish-wallpaper-640x480.png
968ecf6696c5638cfe80e8e70aba239526270864
debian-blueish-wallpaper-640x480.tga
11143e8c92a073401de0b0fd42d0c052af4ccd9b moreblue-orbit-grub.png
d00d5e505ab63f2d53fa880bfac447e2d3bb197c moreblue-orbit-grub.png
f5b12c1009ec0a3b029185f6b66cd0d7e5611019 moreblue-orbit-grub.png
EOF
I understand what its purpose is but am unclear as to the meaning of
. . . if they haven't been touched by the user.
as it doesn't appear possible to alter the sha1sum of a file by touching it.
The background is that I don't have the desktop-base package installed
but do have (or, rather, did have) moreblue-orbit-grub.png from the
package in /boot/grub and am inclined to think its removal is a possible
bug.
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