Ubuntu is an open-source Linux-based operating system published by Canonical, with contributions from other companies and volunteers. There are editions for workstations (Ubuntu Desktop), servers (Ubuntu Server) and embedded devices (Ubuntu Core). A new release appears every six months; every fourth release, roughly every two years, is an LTS version with long-term support. Canonical also sells Ubuntu Pro, commercial support and services around cloud, Kubernetes and OpenStack.
Canonical Ltd is a privately held company headquartered in London, United Kingdom, founded and funded by Mark Shuttleworth. The UK is outside the EU, and Canonical is not owned by a foreign parent company. The core software is free to download and use and can be installed entirely on your own infrastructure, so you decide where your systems and data reside. Paid support and security maintenance are provided by Canonical; the update servers and services involved are outside your own control, which can be a point of attention for environments with strict requirements.