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We've seen an application called KernelCheck to automatically compile and install the latest Kernel in Ubuntu but here is an even easier way to do this.

Go to Ubuntu Kernel PPA and download the .DEB files for the Kernel version you want to upgrade. Yes, it's as simple as that. There is of course, a delay until the Kernel is packed into .DEB packages, but for instance, right now on Kernel.org (off topic: who else thinks the kernel.org website seriously needs a redesign?), the latest stable version is 2.6.31.1 while on the Ubuntu Kernel PPA, the latest stable version is 2.6.31 (the unstable versions are the same).

Why would you want to upgrade the Kernel? Because newer Kernel versions come with lots of fixes and more hardware support thus, if you have problems with let's say your audio or video card, this could be solved in the latest Kernel version.