ray@ray-Kudu-Pro:~$ sudo update-grub
[sudo] password for ray: 
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.4.0-66-generic
Found initrd image: /boot/initrd.img-4.4.0-66-generic
Found linux image: /boot/vmlinuz-4.4.0-64-generic
Found initrd image: /boot/initrd.img-4.4.0-64-generic
Found linux image: /boot/vmlinuz-3.13.0-92-generic
Found initrd image: /boot/initrd.img-3.13.0-92-generic
Found linux image: /boot/vmlinuz-3.13.0-91-generic
Found initrd image: /boot/initrd.img-3.13.0-91-generic
Found linux image: /boot/vmlinuz-3.13.0-88-generic
Found initrd image: /boot/initrd.img-3.13.0-88-generic
Found linux image: /boot/vmlinuz-3.13.0-87-generic
Found initrd image: /boot/initrd.img-3.13.0-87-generic
Found linux image: /boot/vmlinuz-3.13.0-86-generic
Found initrd image: /boot/initrd.img-3.13.0-86-generic
Found linux image: /boot/vmlinuz-3.13.0-85-generic
Found initrd image: /boot/initrd.img-3.13.0-85-generic
Found linux image: /boot/vmlinuz-3.13.0-83-generic
Found initrd image: /boot/initrd.img-3.13.0-83-generic
Found linux image: /boot/vmlinuz-3.13.0-79-generic
Found initrd image: /boot/initrd.img-3.13.0-79-generic
Found linux image: /boot/vmlinuz-3.13.0-77-generic
Found initrd image: /boot/initrd.img-3.13.0-77-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
done
ray@ray-Kudu-Pro:~$