GRUB 2 is the default boot loader and manager for
Ubuntu since version 9.10 (Karmic Koala). As the computer starts, GRUB 2
either presents a menu and awaits user input or automatically transfers
control to an operating system kernel. GRUB 2 is a descendant of GRUB
(GRand Unified Bootloader). It has been completely rewritten to provide
the user significantly increased flexibility and performance. GRUB 2 is
Free Software.
In
this guide, GRUB 2 is version 1.98 or later. GRUB legacy (version 0.97)
will be referred to as GRUB. To determine your version, use grub-install -v.
Grub version 1.99 will be the default on Ubuntu 11.04 (Natty Narwhal)
and introduces some major changes in the Grub file contents. The main
user interface file, /etc/default/grub will appear relatively
unchanged to the user. This guide primarily details the use of Grub
1.98, the Grub release found in Ubuntu 10.04 LTS (Lucid Lynx). Content
reflecting other versions of Grub 2 will be noted in the appropriate
entry.
https://help.ubuntu.com/community/Grub2
