How can I complie/Buid and create image linux kernal, rootfs, boot file and xloader?

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http://askubuntu.com – I have few query regarding Ubantu, please do needful Query 1. From where I get sourse of linux kernal, boot loader, file system, tool chain, xloader for X86 ? It means all these part are include in Ubantu package or get sourse from others and where? 2. Ubantu soure, what are the componet like insite the package where we download? file system is inside the package or not ? 3. How can I change defalt cofiguration and build kernal for my Hardware for Ubantu? Thanks& Regards Bhavesh Dholariya (HowTos)