What ISO did you download that does not have this? The default one I downloaded from the Ubuntu site works just fine, I'm curious what you're downloading that isn't working?
You mean what ISOs don't have universe selected by default?
Well these two for example:
ubuntu-11.04-desktop-i386.iso (SHA1: f54bc1a298d74bb5551f153bdb7e1348c6b94d99)
ubuntu-11.04-desktop-amd64.iso (SHA1: f7b0d2b90fbd49794419338c2b9157c095b11bda)