prerm is in grub-gfxpayload-lists 0.6.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | #! /bin/sh
set -e
if [ "$1" = remove ]; then
rm -f /boot/grub/gfxblacklist.txt
fi
exit 0
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