[xubuntu] Automatic Update show kernel 3.5 with 3.8 installed

Hi,

I have Xubuntu 12.10 x86 installed with kernel 3.8. I installed this kernel using a tutorial in a Liberian Geek site.

Now the "Automatic Updates" show kernel 3.5 to "update" (downgrade im my case). How I block kernel update if it is more lower than my actual kernel?