grub2-signing-extension/sbin/grub2-unsign

#!/bin/bash
# grub2-unsign
# Unsigns every file in /boot. Depends on grub2-verify
# Author: Bandie Kojote
# Licence: GNU-GPLv3

# Check if something is wrong
grub2-verify
if [ $? -eq 1 ]
then
    echo -e "grub2-verify has detected a one or more bad signatures.\nPlease check for malicious software before you're unsigning everything!"
    exit 1
fi


# Then remove the signatures.
find /boot -name '*.sig' -exec rm -- '{}' +

echo "GRUB2 unsigned. WARNING: If you want to deactivate GRUB2's signature feature, change the check_signatures variable in the headers file!"
exit 0