OK, I think I understand now.
If I recall correctly, UCK allows you to enter a live environment on your custom CD. My thought is that, while in this environment, you can open a Terminal and run 'sudo apt-get update && sudo apt-get upgrade'. That will install the latest updates, just like Update Manager would.
Alternatively, I suppose you could simply use Update Manager while in the live environment.
But since we know you can use Synaptic on your live CD, it is probably easiest to upgrade using that. When I open Synaptic, the second large button on the toolbar is "Mark All Upgrades." Do you see that button?
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