Yes, Ubuntu is based on Debian.The_Big_KTo the best of my knowledge, Ubuntu uses Debian Linux source code. Correct me if I'm wrong.
If you need the kernel source code, follow these steps:
1. Make sure you have the source code repository enabled. To do this, go to System>Administration>Software Sources and check the source code repository. Reload the package information.
2. Open a terminal window and type
sudo apt-get install linux-source-2.x.xx
Replace 2.x.xx with the kernel version. If you don't know what your kernel version is, use the following command:
The output will be something like this "2.6.27-9-generic"
In this case you will have to replace 2.x.xx with 2.6.27
Also look at the following post for more information Where can I get Kernel Source Code? - Ubuntu Forums
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