If you don't want that kernel, don't upgrade to it. Instead of using apt or aptitude from command line, use synaptic from GUI and deselect what you don't want upgraded. You have the control, don't let the operating system control you.
And BTW, Debian 6 is stable, which means you probably don't need to apply any updates to begin with. For some reason, people think they will be left behind if they don't have the latest and greatest, if you want the latest and greatest, install Debian testing or go even more bleeding edge with Sid.
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