sudo update-grub
Searching for GRUB installation directory ... found: /boot/grub
Searching for default file ... found: /boot/grub/default
Testing for an existing GRUB menu.lst file ... found: /boot/grub/menu.lst
Searching for splash image ... none found, skipping ...
Found kernel: /boot/vmlinuz-3.19.0-18-generic
Found kernel: /boot/vmlinuz-3.16.0-38-generic
Found kernel: /boot/vmlinuz-3.16.0-31-generic
Found kernel: /boot/vmlinuz-3.13.0-53-generic
Found kernel: /boot/vmlinuz-3.13.0-46-generic
Found kernel: /boot/memtest86+.bin
Updating /boot/grub/menu.lst ... done
it always boot at 3.13.0-31