/usr/sbin/update-grub-gfxpayload is in grub-gfxpayload-lists 0.6.
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 | #! /bin/sh
set -e
mkdir -p /boot/grub
for x in /usr/share/grub-gfxpayload-lists/blacklist/*; do
[ -e "$x" ] || continue
cat "$x"
done >/boot/grub/gfxblacklist.txt.new
mv /boot/grub/gfxblacklist.txt.new /boot/grub/gfxblacklist.txt
exit 0
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