This is where containers can help. Ubuntu ships with LXC and its relatively simple to download an Alpine Linux container and then install Nginx and you are set. Alternatively Flockport [self plug] provides an open source app store [1] for LXC and you can download a prebuilt Nginx114 container all set to go.
But containers are some work with both upsides and downsides and upsides compared to having it out of the box in the distribution.