Backtrack grub and Ubuntu grub

[Mulan]

I have given an assignment on the topics Backtrack grub and Ubuntu grub. Since, I am not having much knowledge about it, I thought to take some help from you guys. Please provide some basic concepts so that I can understand it. Once I understood, I can do the rest of things by my own. But initially I require some help from you all guys. Please provide some detailed information about the grubs that are used in Backtrack and Ubuntu.

[Warner]

The boot loader is a program launched just after loading the BIOS. It enables the user to choose which operating system it wants to run. In the case of Linux, the boot loader also allows the user to choose which kernel to load. There are two main Linux bootloaders are grub and lilo. There are other, but we shall not see in this course. The bootloader can facilitate repair of a Linux system in some cases (loss of the root password, maintenance on the file systems).

[Michael25]

Lilo is separated into two stages :

• The stage_1 is a small program (<= 512 bytes)
• The stage_2, called a boot loader,

The above can be placed in the MBR (Master Boot Record) or a floppy disk. This course is the second appeal that has more memory. The stage 2 is usually placed on the hard disk.

[Samarth]

Grub (GNU Grand Unified Bootloader) is a bootloader that is becoming increasingly common. Such as lilo, grub runs through internships. In addition to the two courses mentioned in lilo, grub includes an intermediate stage, the stage 1_5 which loads stage 2 on any file system. To install GRUB you will type the following commands :

root @ localhost grub #
 grub> root (hd0, 1) # partition where files are
				 # Grub configuration
 grub> setup (hd0) # Location stage_1 here MBR
 grub> quit

[Pratim]

Such as lilo, grub has a configuration file: "/ boot / grub / grub.conf".

timeout = 30 # Waiting time in seconds before the default boot.
 default = 0 # System default by the first of the list.

Configuration for Linux :

title Linux # name that will appear in the list
 root (hd1, 0) # Partition where the files
		 # Grub configuration

[Lane]

You should also know that the location of the image followed were leaving the "/".

initrd / initrd.img ramdisk image #

Configuration for Windows would be as :

title Windows
 rootnoverify (hd0, 0)
 chainloader +1

[napoleon]

I think grub that keeps you will simply modify the kernel will see in the folder / boot. The following are some steps to fix your grub :

1. We must start with the live cd of ubuntu (8.10 or 9.04) and we enter ubuntu.
2. Being in the terminal we have to have root permission (Administrator) to have permissions you can do you put this: sudo passwd and press enter.
3. After you enter sudo su - and press enter you must appear something like root @ ubuntu with this means that you are already root.
4. Now type grub and press enter, you must be on grub.
5. Grub> find / boot/grub/stage1 and press enter there shows you that you installed linux partition is something like (hd0, 1).
6. grub> root (hd0, 1) and press enter
7. grub> setup (hd0) and press enter and go.

This is one of many ways to restore the grub.