[ubuntu] easiest way to revert/upgrade to a specific kernel version?

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http://ubuntuforums.org – Hello, What is the easiest way to revert back to an older kernel version? If I do a fresh install, what's the easiest path to update to a specific kernel version? I have two machines and need both to be in perfect sync version both are 11.10 based. In one I have kernel version 3.0.0-21-generic which broke the C++ project I am working on and would like to revert it back to 3.0.0-19-generic. Likewise I had to fresh reinstall 11.10 on my Desktop due to unusable/non-bootable system after upgrading to kernel 3.0.0-22-generic. The fresh install from CD installs version 3.0.0-12-generic and I wo (Hardware)