How Is Lubuntu Related to Ubuntu, and What Desktop Does It Use?

Lubuntu is an official Ubuntu-based operating system that replaces Ubuntu's default desktop with LXQt, a lightweight desktop built on Qt technologies. It keeps the Ubuntu Linux base, so the same software packages, file formats, and hardware compatibility apply, but the interface is designed to stay fast and energy-saving on older or more limited machines. If you want Ubuntu's foundation without GNOME's resource footprint, Lubuntu is the variant to consider.

The Ubuntu connection

Lubuntu is not a separate distribution built from scratch. According to lubuntu.me, it is "built with a rock-solid Ubuntu Linux base," which means:

• Same package ecosystem — thousands of free applications are available, and the site points users to the Discover Software Center to download what they need.
• Same compatibility story — Lubuntu handles the majority of existing file formats (images, songs, films, spreadsheets, text documents, internet radio) out of the box, and can share files with other computers and operating systems.
• Optional extras — for more exotic (usually proprietary) formats, the site recommends installing the ubuntu-restricted-extras package.

In practice, this means anything you know about installing, updating, or troubleshooting Ubuntu generally carries over. The difference is the desktop layer and the default set of apps, not the underlying system.

What desktop does Lubuntu use?

Lubuntu ships the LXQt desktop, described on the site as "the most advanced desktop interface, using Qt technologies for rendering the widgets and the entire ecosystem (from the installer to the smallest parts)."

The visual design combines two elements:

The stated goal is a desktop that is "easier to read and less cluttered," with sharp edges and vibrant colours that add visual dynamics "without overwhelming the overall design." Compositing effects make apps, panels, and widgets look modern while keeping the system "fast, simple and affordable for almost every machine."

Why the desktop choice matters

The LXQt desktop is the main reason Lubuntu exists as a distinct option. A lighter desktop typically consumes fewer system resources than a full-featured one, which is why the site frames Lubuntu as suitable "from maximum performance machines to those with older and more limited hardware" and invites users to "revive that old PC."

Two practical consequences follow:

1. Hardware reach — Lubuntu is offered in multiple ISOs for standard PCs, laptops, Raspberry Pi, and other architectures, with a QA team checking each release per architecture.
2. Daily-use completeness — despite the lighter desktop, Lubuntu still ships what the site calls "the essential apps and services for daily use": office applications, a PDF reader, an image editor, and music and video players.

How to decide

Choose Lubuntu if you want the Ubuntu base and software compatibility but prefer a Qt-based, lightweight desktop — especially on older or low-spec hardware. Choose standard Ubuntu instead if you specifically want its default desktop environment and the workflow that comes with it. Both share the same foundation, so the desktop is the deciding factor, not the software you can run.

The current release referenced on the site is Lubuntu 26.04.1, featuring the LXQt desktop.