Why is adding a new Ubuntu PC to an existing LAN such a pain?

[Mario Vukelic]

On Sat, 2007-01-20 at 20:54 +0000, Bob Adams wrote:
> 
> Why is adding a new Ubuntu PC to an existing LAN such a pain?
(...)
> The first Ubuntu machine is configured easily but add any additions
> after that and something gets very screwed. 

I've never seen this (I use DHCP for IP addresses). I don't think it is
a fundamental problem with Ubuntu, but something special in your setup.
Can you give more details about your setup?