First go to the below link and find the latest kernel version. Currently its - linux-2.6.26
Download it using wget
# wget http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.26.tar.gz
And copy it under /usr/src
# cp linux-2.6.26.tar.gz /usr/src
Go to this directory
# cd /usr/src
And extract the kernel from the compressed file. This command will create a new folder called linux-2.6.26
# tar zxf linux-2.6.26.tar.gz
Now go to the directory that contains your new kernel
# cd linux-2.6.26
And get your old configuration
# make oldconfig
If you have qt libraries installed on your system run # make xconfig. This is the graphical configuration system through which you will make all the necessary changes in your kernel. If you have only ncurses installed you may run # make menuconfig
# make xconfig or # make menuconfig
When you have configured everything run make to start compiling your kernel
# make
Then run make modules_install to install your new modules created above.
# make modules_install
And finally create all the necessary files under /boot and also configure grub to include your new kernel
# make install
Reboot and from grub choose the new kernel! If anything goes wrong it means you have made a mistake in the kernel configuration. Boot in with your old kernel and run again make xconfig to do the appropriate changes.
# reboot
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source:http://linuxpoison.blogspot.com/2008/07/135781758016013.html