ray@ray-Kudu-Pro:~$ sudo update-grub
[sudo] password for ray:
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-4.4.0-64-generic
Found initrd image: /boot/initrd.img-4.4.0-64-generic
Found linux image: /boot/vmlinuz-4.4.0-63-generic
Found initrd image: /boot/initrd.img-4.4.0-63-generic
Found linux image: /boot/vmlinuz-4.4.0-31-generic
Found initrd image: /boot/initrd.img-4.4.0-31-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
Found Linux Lite 2.8 (14.04) on /dev/sda3