I've recently downloaded the 18.04 server version and installed it on a couple of VMs. On first boot after installation, here are the contents of my /etc/apt/sources.list
deb http://archive.ubuntu.com/ubuntu bionic main
deb http://archive.ubuntu.com/ubuntu bionic-security main
deb http://archive.ubuntu.com/ubuntu bionic-updates main
Shouldn't it be longer? I've seen a number of supposed standard examples of the file, including both universe and multiverse repos.
How do I fix it? Does it have something to do with the options chosen during the interactive install, or is there something wrong with the official distribution? Any way to fix it right away outside of recompiling the iso?