upgrade 12.04->14.04

[steve reilly]

> Can you explain why you want to upgrade just the kernel?  Or perhaps
> that is not what you mean.  An upgrade to Ubuntu 14.04 does much more
> than just upgrade the kernel.  It upgrades all the other software too,
> so no, you cannot easily go back, you would have to re-install 12.04.
>
basically what i was asking was, when i boot, im given 5 or 6 different
kernels to boot.  top one being the most recent.  3.13something.  if i boot
this kernel and run the upgrade, do all the previous kernels disappear?  or
do they stay at 12.04?
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