|Developer||Q4OS development team|
|Source model||Open source|
|Latest release||Q4OS 4.10 (Gemini) / August 1, 2022|
|Platforms||x86-64, i386, armhf, arm64|
|Kernel type||Linux kernel|
|TDE, KDE Plasma|
|License||Free software licenses (mainly GPL) + some proprietary|
Q4OS is a light-weight Linux distribution, based on Debian, targeted as a replacement for operating systems that are no longer supported on outdated hardware. The distribution is known for being similar in appearance to Microsoft Windows operating systems with some of its pre-installed themes inspired by the look and feel of Windows 2000 and Windows XP.
Development of Q4OS began in 2014 to coincide with Windows XP's end of extended support in the same year.
LXQt Desktop Environment was included from April 2014 to June 2015.
In 2018 TDE (Trinity Desktop Environment) was included.
In 2019, version 3.8 was released which was based on Debian Buster.
The original KDE based version has been discontinued since around 2018.
As of April 2020, the core developers of Q4OS, initially starting the project in Germany, are now operating in Prague, Czech Republic.
It comes with either the Trinity Desktop Environment, which is a fork of K Desktop Environment 3. or KDE Plasma 5
LookSwitcher, which lets the user switch visual themes
Desktop Profiler, which automatically installs some packages and programs that may be ideal for the user according to the profile that they choose
Q4OS Software Centre, which lets the user install some recommended packages and programs from a list
Q4OS Welcome Screen, which helps the user with some initial tweaks
Stable versions of Q4OS are derived from Debian's Stable release branch with long-term support that lasts five years after their initial release. Developmental "testing" versions of future releases are derived from the Debian Testing branch.
|Latest preview version of a future release: 0.5.17||2014-07-17||"Development" version|
|Latest preview version of a future release: 1.1-RC2||2015-04-14||Second release candidate of Q4OS 1.1|
|Old version, no longer maintained: 1.2||Orion||2015-04-27||Initial version to be specified under codename Orion|
|Old version, no longer maintained: 1.2.3||2015-06-08||The LXQt desktop environment is now supported|
|Old version, no longer maintained: 1.4||2015-09-04||Initial version to support devices running on ARM architecture|
|Old version, no longer maintained: 1.6.3||2016-08-05||Implemented UEFI support|
|Old version, no longer maintained: 1.8.4||2017-04-26||Icedove is replaced with Mozilla Thunderbird, LXQt is unsupported|
|Latest preview version of a future release: 2.0.2||Scorpion||2016-01-06||Initial testing version of Q4OS Scorpion|
|Latest preview version of a future release: 2.3.6||2017-10-04||"Final beta" release|
|Older version, yet still maintained: 2.4||2017-10-04||2022-10||Initial stable release of Q4OS Scorpion and to provide long-term support|
|Older version, yet still maintained: 2.5||2018-06-03||2023-06||TDE is now bundled with KDE Plasma|
|Latest preview version of a future release: 3.1||Centaurus||2018-01-29||Initial testing version of Q4OS Centaurus|
|Older version, yet still maintained: 3.8||2019-07-15||2024-07||Initial stable release of Q4OS Centaurus|
|Older version, yet still maintained: 3.10||2020-01-04||2025-01||TDE and KDE Plasma have been split into separate installation images|
|Older version, yet still maintained: 3.13||2020-12-19||2025-12||The Snap daemon has been removed from default installation|
|Latest preview version of a future release: 4.0||Gemini||2020-02-16||Initial testing version of Q4OS Gemini|
|Older version, yet still maintained: 4.6||2021-09-27||2026-09||Initial stable release of Q4OS Gemini|
|Older version, yet still maintained: 4.7||2021-11-22||2026-11|
|Older version, yet still maintained: 4.8||2022-04-05||2027-04|
|Current stable version: 4.10||2022-08-01||2027-08||Latest stable release of Q4OS|
SourceForge featured Q4OS as "Community Choice" Project of the Month in April 2020.
In January 2022, TechRadar considered Q4OS as one of the best light-weight Linux distributions of the year for its Windows installer and support for older hardware, notably systems running on 32-bit processors.
The Linux distribution Quark is Q4OS with Ubuntu as the base instead of Debian.
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