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GNU Grub: A Beginners Guide And HowTo Collection

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:
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I turn my Linux computer off and when I turn it on it runs disk check (fsck) on hard disk. Why?

A typical question asked by many new Linux users. The answer is pretty simple:

Your partitions are not being unmounted properly when you last shutdown the Linux desktop. Linux needs to shutdown properly (I’m sure this applies to Windows and Mac OS too) before powered off. If you skip this step there could be data loss.

If you are using text based session (CLI), type following command as privileged user:
shutdown -h now

If you are using GUI (KDE / Gnome or any other Windows Manager) click on System > Quit button. Look out for shutdown button.

Do not unplug the power supply. Also use UPS (Uninterruptible power supply) to protect data and to avoid other problems. I recommend APC ups for continuous supply of electric power.

Updated for accuracy.