Trying to upgrade libc6: aptitute wants to remove the kernel.

[Adam Funk <a24061@yahoo.com>]

I've got a mixed stable/testing system which I've been trying to upgrade
and dist-upgrade for a while.  Whenever I try to `aptitude install
libc6` to testing or unstable, with various options, I get this ominous
warning:

The following packages will be REMOVED:
  base-config initrd-tools kernel-image-2.4.23-1-386 
  kernel-image-2.4.26-1-k7 kernel-image-2.4.27-1-k7 
  kernel-image-2.4.27-2-386 kernel-image-2.4.27-2-k7 

I think there's a way to get over this hump without making my computer
unbootable, but I can't figure it out.  I'd appreciate any suggestions.

Thanks,
Adam