Ошибка: файл '/boot/grub/i386-pc/normal.mod' не найден ПОМОЩЬ PLS

Это работает (проверено):

#!/bin/bash

filenames=$(find . -type f) # stores all filenames in $filenames
for filename in $filenames; do # for each member in $filenames
    newfilename=$(echo "$filename" | sed 's/\(.*\)\/\(..\)\(.*\)$/\1\/\2\.\3/') # edits $filename by adding a . after the second character and stores the edited string in $newfilename
    mv "$filename" "$newfilename" # renames $filename to $newfilename
done