modify_compile_linux_kernel_in_ubuntu [pswiki]

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====== Modify / Compile linux kernel for ubuntu ======
there are thousands of methods to do this, but let's do it with all the nice help we can get from ubuntu.. 

these steps are based on the [[https://help.ubuntu.com/6.10/ubuntu/installation-guide/i386/kernel-baking.html|ubuntu documentation about building a kernel]] and some [[https://help.ubuntu.com/community/Kernel/Compile|Ubuntu community howto about compiling a kernel]] 

  * cd into a directory where you want to have your kernel sources downloaded to
  * install all the packages needed and download the sources

  apt-get install fakeroot kernel-wedge build-essential makedumpfile kernel-package libncurses5-dev
  sudo apt-get build-dep linux
  apt-get build-dep --no-install-recommends linux-image-`uname -r`
  apt-get source linux-image-`uname -r`

  * in ubuntu 10.04 you need to copy the package scripts for ubuntu because otherwhise the initrd file will not be generated (more details in [https://help.ubuntu.com/community/Kernel/Compile|this wiki article]])
  
  cp linux-2.6.32/debian/control-scripts/{postinst,postrm,preinst,prerm} kernel-package/pkg/image/
  cp linux-2.6.32/debian/control-scripts/headers-postinst kernel-package/pkg/headers/

  * cd into the linux-xxx directory that was created containing the sources
  * if you want, edit the config 

  make menuconfig

  * compile and build a deb package (nothe, the overlay-dir is only needed for ubuntu 10.04 (and maybe later too?))

  make-kpkg clean
  fakeroot make-kpkg --overlay-dir=$HOME/kernel-package/ --initrd --append-to-version=-custom.1.0 kernel_image kernel_headers

  * install the new kernel 

  dpkg -i ../linux-image-.....deb
  dpkg -i ../linux-headers-.....deb

  * reboot :)