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I heard that Ubuntu is open source and that all its source code is available, but I have never seen its code. I want to start learning about Ubuntu's kernel and its complete working.Please suggest me some reading from where I can start.

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marked as duplicate by Uri Herrera, fossfreedom Feb 7 '13 at 9:39

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You can download the source code of ubuntu kernel, using

sudo apt-get install linux-source

A bzip file will be downloaded at /usr/src/ containing the source code.

However, ubuntu codes are taken from the orginal linux kernel which is available for download at http://www.kernel.org/.

To understand the kernel, you must start with basics of operating system.How kernel works, a general idea about subsystem/modules/drivers. Also needed very good knowledge C (specially pointers). Otherwise jumping into code of linux kernel won't help at all.

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+1 for adding a reference to kernel.org –  don.joey Feb 7 '13 at 6:49
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