Lubuntu is described as 'Fast and lightweight operating system with a clean and easy-to-use user interface. It is a Linux system, that uses the minimal desktop LXDE/LXQT' and is a very popular Linux Distro in the os & utilities category. There are more than 100 alternatives to Lubuntu for a variety of platforms, including Linux, Self-Hosted, Windows, Mac and Raspberry Pi apps. The best Lubuntu alternative is Linux Mint, which is both free and Open Source. Other great apps like Lubuntu are Ubuntu, Fedora, Zorin OS and Manjaro Linux.
Linux distribution focused on desktop use, with unique menus, media codecs, browser plugins, and DVD support pre-installed; offers easy package management, compatibility with Ubuntu repositories, and a Debian-based alternative for consistency and reliability.
Lubuntu is designed to be fast and usable on older computers. Linux Mint is a heavyweight, full-featued OS that would slow an older PC to a crawl.
Ubuntu is a community developed, Linux-based operating system that is perfect for laptops, desktops and servers. It contains all the applications you need - a web browser, presentation, document and spreadsheet software, instant messaging and much more.
A key feature of Lubuntu is its light-weightedness. Ubuntu couldn't be any farther from this.
Lubuntu is a lightweight OS specifically designed to be fast and compatible with older hardware. Ubuntu is not lightweight.
Lubuntu works much faster, than Ubuntu. LXDE desktop environtment is not so massive, than Unity.
Fedora creates an innovative, free, and open source platform for hardware, clouds, and containers that enables software developers and community members to build tailored solutions for their users.
Linux-based OS designed for familiar user experience, mimicking Windows or macOS, supports dual-boot, runs Windows apps via WINE, pre-installed essential software, customizable desktop layouts, broad hardware compatibility, and privacy-focused updates.
Manjaro is a user-friendly Linux distribution based on the independently developed Arch operating system. Within the Linux community, Arch itself is renowned for being an exceptionally fast, powerful, and lightweight distribution that provides access to the very latest cutting...
Not as lightweight as Lubuntu.
Kubuntu is an official "flavor" of Ubuntu that uses the KDE Plasma desktop environment. This gives it a completely different look and feel.
elementary OS is a free, fast and aesthetically pleasing operating system based on Ubuntu .
Free Linux-based OS from KDE community, emphasizing safety, functionality, and advanced desktop technologies, integrating Plasma and KDE apps for home, enterprise, public, or pre-installed computer use, prioritizing updates, usability, and customization.
A Unix-based OS for Mac with seamlessly integration with Apple’s ecosystem, offering an intuitive UI, productivity tools like Finder, Spotlight, and Automator, built-in apps like Safari and Photos, Continuity for cross-device functionality, and security features including FileVault and Gatekeeper.
too much OS bloat, not based on Linux, proprietary to Apple hardware
macOS is not free, and only comes with apple computers.
Xubuntu is still light weight distro, with richer features and software. It's more user friendly. Its XFCE is closer to those well-known full featured desktop enviroments like Unity, Gnome and KDE than LXDE is.
I prefer to use it instead of Lubuntu, because Xfce is way better than LXDE and both don't consume too many resources.
NixOS is a GNU/Linux distribution that aims to improve the state of the art in system configuration management. In existing distributions, actions such as upgrades are dangerous: upgrading a package can cause other packages to break, upgrading an entire system is much less...
ReactOS™ is a FOSS effort to develop a quality operating system based on the architecture of Microsoft® Windows™ NT family of operating systems, that is compatible with applications and drivers written for it (NT4, 2000, XP, 2003, Vista, 7).
Not completely finished, although not sure about how lightweight it is. Maybe someday it might be a good alternative.
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With the XFCE desktop, Mint isn't quite as lightweight as Lubuntu, but it is still fast and a good choice for older hardware.