This is GRUB 2, the second version of the GRand Unified Bootloader.GRUB 2 is rewritten from scratch to make GNU GRUB cleaner, safer, morerobust, more powerful, and more portable.
More extensive documentation is available in the Info manual,accessible using 'info grub' after building and installing GRUB 2.There are a number of important user-visible differences from thefirst version of GRUB, now known as GRUB Legacy. For a summary, pleasesee: info grub Introduction 'Changes from GRUB Legacy'