This is the output of update-grub :
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-4.2.0-18-generic
Found initrd image: /boot/initrd.img-4.2.0-18-generic
Found linux image: /boot/vmlinuz-4.2.0-16-generic
Found initrd image: /boot/initrd.img-4.2.0-16-generic
Found linux image: /boot/vmlinuz-3.19.0-32-generic
Found initrd image: /boot/initrd.img-3.19.0-32-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
done
Should I do something to the grub configuration ?