Alpine Linux is a Linux distribution based on musl and BusyBox, primarily designed for "power users who appreciate security, simplicity and resource efficiency".
License: Open Source
Ubuntu Server brings economic and technical scalability to your datacentre, public or private. Whether you want to deploy an OpenStack cloud, a Hadoop cluster or a 50,000-node render farm, Ubuntu Server delivers the best value scale-out performance available. Developed by Canonical Ltd
License: Open Source
Alpine Linux is designed for security and performance, making it ideal for lightweight and containerized applications. In contrast, Ubuntu Server is more user-friendly and suitable for a broader range of server applications, backed by a larger community and extensive documentation.