I had the same issue with grub-cutomizer, but I solve it removing the whole directory /etc/grub.d/proxifiedScripts/ also you need to remove a file than invokes the script: /etc/grub.d/LS_Linux. If you don’t want to remove them, just copy them in your home directory as a backup. Start your grup-customizer again and this regerates the proxifiedScripts without the error.
1 Like