Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.
Found linux image: /boot/vmlinuz-4.8.0-32-generic
Found initrd image: /boot/initrd.img-4.8.0-32-generic
Found linux image: /boot/vmlinuz-4.8.0-22-generic
Found initrd image: /boot/initrd.img-4.8.0-22-generic
Use netcat.
Found Windows Boot Manager on /dev/sdc2@/efi/Microsoft/Boot/bootmgfw.efi
Adding boot menu entry for EFI firmware configuration
done

And the error message:
System program error detected.
Do you want to report the problem now?