Distros

Ultimate Edition, first released in December 2006, was a fork of Ubuntu and Linux Mint though recent versions (starting in 2024) have been based on Arch Linux. The goal of the project is to create a complete, seamlessly integrated, visually stimulating, and easy-to-install operating system. Single-button upgrade is one of several special characteristics of this distribution. Other main features include custom desktop and theme with 3D effects, support for a wide range of networking options, including WiFi and Bluetooth, and integration of many extra applications and package repositories.

Ultramarine Linux is a Fedora-based distribution featuring extra package repositories such as RPM Fusion and enabling multimedia codecs. Ultramarine can be considered a spiritual successor to Korora Project and aims to make Fedora a more desktop-friendly experience.

umbrelOS is a Debian-based Linux distribution for home servers. It is available for standard 64-bit and Raspberry Pi computers. The distribution features a web-based user interface and an online app store with a large range of applications, anything from web hosting, productivity and finance to media streaming, networking, automation, artificial intelligence, development and Bitcoin mining. umbrelOS is developed by the US-based Umbrel, Inc., which also sells palm-sized personal home computers with up to 4 terabytes of storage.

Uncom OS is Russian commercial Linux distribution based on Ubuntu's long-term support branch and localised into Russian. It is developed by Advilabs-Rus LLC. Some of the distribution's more interesting features include a custom application store, out-of-the-box support for Flatpak packages, a Windows-style dock panel, extended support for VPN protocols, a custom application for restoring system integrity, and use of Bottles to run Windows applications. Besides commercial "Home", "Business" and "Education" editions of Uncom OS, the company also offers a freely downloadable trial variant for testing purposes.

Univention Corporate Server is an enterprise-class distribution based on Debian. It features an integrated management system for central administration of servers, Microsoft Active Directory-compatible domain services, and functions for parallel operation of virtualised server and desktop operating systems. UCS offers such features as a single sign-on portal and an app centre. One key component of UCS is the Identity and Access Management (IAM) utility which acts as a central solution for managing identities, roles, and groups. The integrated portal with Single Sign-On and self-service functions provides access to all IT services and applications and can work across blended Linux, Windows, and macOS networks.

Unraid OS is a Linux-based commercial operating system designed to provide an easy-to-use and flexible platform for building and managing a Network-Attached Storage (NAS). Some of Unraid's main features include the ability to mix and match drives of different sizes, an easy-to-use web interface for managing storage, virtual machines and Docker containers, protection to safeguard against drive failures, ability to expand the storage by adding more drives.

UOS is the product of UnionTech Software, which is a Chinese company focusing on Linux operating system products and services. UOS can be run on desktops, servers, and smart terminals, and also for cloud-native scenarios.

VailuxOS is a German, desktop-oriented Linux distribution based on Ubuntu's long-term support (LTS) branch or Debian's "Stable" branch. The project's primary goal is to make the transition from Windows to Linux as seamless as possible by maintaining familiar ways of working and workflows. The distribution uses the KDE Plasma desktop.

Vanilla OS, a fixed-release distribution based on Debian (formerly Ubuntu, prior to version 2) with the GNOME desktop, is an immutable operating system. The core parts of the system are locked down to prevent unwanted changes and corruption from third-party applications or a faulty update.