GNU Grub allows you to have several operating system on system and user can select one to start. Grub allows you to boot different kernels, operating system, floppy / cd boot and network boot. Dedoimedo.com has published article about how to setup and configure GRUB bootloader with multiple operating systems. This article is a compilation of sources and examples that will help you learn about GRUB. New Linux users will probably find the notion of spending hours searching for relevant pieces of information (especially if their PC won't boot) somewhat frustrating. The goal of this guide is to help provide simple and quick solutions to most common problems regarding multi-boot setups and installation of Linux operating systems:
One of the most frightening things about Linux is the horrible word bootloader. The primary reason for this is the fact that most new Linux users have only ever used Windows operating systems. In the Windows world, they have never bothered with bootloaders. For them, the issue of a system booting was a transparent one. At most, they would use Windows Recovery Console to fix problems for them. Thus, they have been spared the need to learn about the single most important piece of software on a computer - the little program that makes it all work.
This article is supposed to provide you with basic understanding of the GRUB bootloader. If you have read my other Linux articles, you are familiar with partitioning and Linux notation, as well as with the command line. The next logical step is to enhance this knowledge by taking one step further. Understanding how GRUB works and what boot entries in the boot menu mean will help you understand how the operating systems work, how to fix, recover or modify the GRUB menu to suit your needs, and how to setup different work environments with several operating systems.
Read full "Grub boot loader tutorial" here.
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