how to change the (kernel) boot loader?

Hi,

I don't really understand what you mean by "change the kernel". 3 versions of the kernel are available in the repositories:

linux-image-2.6.22-14-generic - Linux kernel image for version 2.6.22 on x86/x86_64
linux-image-2.6.22-15-generic - Linux kernel image for version 2.6.22 on x86/x86_64
linux-image-2.6.22-16-generic - Linux kernel image for version 2.6.22 on x86/x86_64

(several architectures are available for each version, just pick the right one). You can install any one of them as usual (synaptic), and you'll have a choice when booting.

Otherwise, you can try to compile your own kernel etc. It's a heavy task, in particular you'll spend days to understand the meaning of all options, and you really need to understand what you're doing (that is exactly why Ubuntu provides pre-compiled kernels).

By the way, what do you mean by "not very nice"? Have you experienced any bugs with the standard Ubuntu kernel?

sorry, i dont know abuot the kernel. I m new linux user. I think the screen of chose 1 operating system is called linux kernel. pls tell me how to change it.

Hi,

OK, so it's not the kernel at all. The kernel is the central part of the operating system (see http://en.wikipedia.org/wiki/Operating_system and http://en.wikipedia.org/wiki/Kernel_(computer_science) if you are interested). Don't try to use technical words, I think "the screen where you choose the operating system" is perfectly clear. Its technical name is "boot loader" or "multiboot loader", and the one provided by default by Ubuntu is called "grub".

I know only one alternative : lilo. But lilo is older and not really considered as better than grub. I don't really understand why you want to change it; perhaps you just want to customize it? You can find a lot of tutorials, such as http://hacktivision.com/index.php/2008/01/24/how-to-customize-grub-in-ubuntu?blog=2