Q. I’m using CentOS Linux and I’d like to create bootable Linux CD for the same. How do I create an installation boot disk?
A. You need to find images/ directory located on CentOS / Fedora / RHEL or any other Linux distribution. This directory contains image files that can be used to create media capable of starting the Linux installation process.
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Q. I’m willing to try out Ubuntu Linux but my question is Does Linux grub replace Windows MBR? Can I dual boot between Windows and Linux system?
A. Yes when you install GRUB on first partition, windows MBR get replaced. In most cases GRUB automatically adds an entry for Windows XP / Vista so that you can enjoy dual booting out of box after Ubuntu Linux installation.
In case if you made any mistakes while performing Linux installation you can restore GRUB.
I recommend making a backup of all important data / files before making any changes to MBR / file system or operating system or Ubuntu Linux installation.