sub
install_grub
{
+ system('rm -rf /boot/efi/*');
system('apt-get install -y grub-efi-arm64-signed-');
system("echo 'grub-efi-arm64 grub2/update_nvram boolean false' | debconf-set-selections");
system("echo 'grub-efi-arm64 grub2/force_efi_extra_removable boolean true' | debconf-set-selections");