+sub
+install_grub
+{
+ system('apt-get install -y grub-efi-arm64-signed-');
+ system('grub-install --target=arm64-efi --efi-directory=/boot/efi --removable');
+ system('update-grub');
+ 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");
+ system("dpkg-reconfigure -fnoninteractive grub-efi-arm64");
+}
+