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
Qubes OS focuses on security and isolation through virtualization, making it ideal for high-security environments, while Ubuntu Server is known for its user-friendliness and extensive software availability, making it suitable for a wide range of server applications.