I downloaded the kernel from the kernel.ubuntu.com repository and I am playing with it.
The kernel can be compiled using make oldconfig, make all and make modules_install. Then the kernel image can be copied to the /boot folder and the modules to the /lib.
So, why there is an another way to do it using debian/rules?
Doesnt it make it more complicated?
My second question is that I ran make mrproper and the directory debian was automatically deleted. How can I restore the debian directory again because all the rules pertaining to the compilation are stored there.