Synaptic/apt error

[Lisa Durham]

I was trying to install Xine by using Synaptic / apt. I use the 
fedora.us and livna.org repositories.

After downloading 8 packages needed (for xine and kaffeine) I get the 
following error once it has downloaded the rpms and begins to install:

Error: 0 unsigned packages
5 unknown signatures
0 illegal/corrupted signatures

When I click ok, it stops and won't install the packages. How do I work 
around this, or do I want to work around this?

I have the same exact problem on two seperate machines.

thanks,

Lisa