Following are the steps to compile a kernel source code on ubuntu-
  1. Change to root : su
  1. Update the package manager : apt-get update
  1. Get new make utility : apt-get install build-essential
  1. Optional - To create dep : apt-get install kernel-package libncurses5-dev fakeroot wget bzip2
  1. Download linux source : cd /usr/src

Download patches: v2.6/testing/patch-2.6.27-rc1.bz2
  1. Then we unpack the kernel sources and create a symlink linux to the kernel sources directory:
tar xvjf linux-
ln -s linux- linux
cd /usr/src/linux
  1. Apply patches:
bzip2 -dc patch-2.6.27-rc1.bz2 | patch -p1 
bzip2 -dc 2.6.27-rc1-mm.bz2 | patch -p1 
  1. Execute : make clean
make mrproper
  1. Configure kernel:
Copy already existing config file:
cp /boot/config-`uname -r` ./.config
make menuconfig
Go to Load an Alternate config file. Enter .config and enter. Exit
  1. Make kernel: make && make modules_ install && make install
Check if depmod is already not done.
If not done then type: depmod 2.6.27-rc1-mm
  1. To use initrd then get yaird:
apt-get install yaird
  1. Execute:
mkinitrd.yaird –o /boot/initrd.img-2.6.27-rc1-mm1 2.6.27-rc1-mm1
If this doesn’t work then execute:
mkinitramfs –o /boot/initrd.img-2.6.27-rc1-mm1 2.6.27-rc1-mm1
Update grub (/boot/grub/menu.lst): update-grub
Check the menu.lst file and see the entry of new kernel
  1. Reboot