Edit /etc/grub.d/40_custom file to add a custom entry in grub2 menu.
$ sudo vim /etc/grub.d/40_custom
[...]
menuentry "Live" {
set root='(hd0,1)'
linux /boot/vmlinuz-3.2.0-24-generic boot=live toram=fs.squashfs
initrd /boot/initrd.img-3.2.0-24-generic
}
[...]
Update grub configuration to apply changes.
# update-grub
Use uname command to print kernel release.
$ uname -r 3.2.0-24-generic