Where do you find driver sources for ubuntu? [closed]

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http://serverfault.com – The ubuntu mainline faq states: By definition the mainline kernel builds are made from virgin unaltered mainline kernel sources and therefore do not, and should not, include any Ubuntu patches or drivers. There are also no binary drivers for these kernels. Where do I find sources (or binaries) for the most basic drivers, like for example b44 and iwl3945? (HowTos)