nikolov@ubuntu-ivan:~$ sudo su
[sudo] password for nikolov: 
root@ubuntu-ivan:/home/nikolov# update-grub
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.10.0-22-generic
Found initrd image: /boot/initrd.img-4.10.0-22-generic
Found linux image: /boot/vmlinuz-4.10.0-19-generic
Found initrd image: /boot/initrd.img-4.10.0-19-generic
Found memtest86+ image: /memtest86+.elf
Found memtest86+ image: /memtest86+.bin
Found Windows 10 on /dev/sdb1
done
root@ubuntu-ivan:/home/nikolov#