Maybe, but Ubuntu Server has serious downsides when it comes to security updates. Canonical only releases security updates for main/restricted, while Debian releases security updates for the whole distribution. So, if you are using packages from universe/multiverse (which I guess a lot of people do), security updates are not guaranteed. Or as Canonical puts it:
Canonical does not provide a guarantee of regular security updates for software in the universe component, but will provide these where they are made available by the community.