<a href="http://www.pleaseguide.me/367/how-to-get-the-source-code-of-ubuntu">http://www.pleaseguide.me/367/how-to-get-the-source-code-of-ubuntu</a>
在按书作测试，有难点一一解决。
and to access kernel source code:
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:
uname -r
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
