# sudo update-grub2
Generating grub.cfg ...
Found linux image: /boot/vmlinuz-3.8.0-44-generic
Found initrd image: /boot/initrd.img-3.8.0-44-generic
Found linux image: /boot/vmlinuz-3.8.0-42-generic
Found initrd image: /boot/initrd.img-3.8.0-42-generic
Found linux image: /boot/vmlinuz-3.2.0-67-generic
Found initrd image: /boot/initrd.img-3.2.0-67-generic
Found linux image: /boot/vmlinuz-3.2.0-65-generic
Found initrd image: /boot/initrd.img-3.2.0-65-generic
Found linux image: /boot/vmlinuz-3.2.0-64-generic
Found initrd image: /boot/initrd.img-3.2.0-64-generic
Found linux image: /boot/vmlinuz-3.2.0-51-generic
Found initrd image: /boot/initrd.img-3.2.0-51-generic
  No volume groups found
done