Linux Distributions

The previous chapter explained that Linux is technically just a kernel — the core of the operating system that interacts directly with the hardware. The kernel alone is not enough to become a daily-use operating system. It needs to be complemented with a shell, system utilities, a package manager, and various other components so that users can actually use it for work.

The question that arises is: who collects, configures, and packages all these components into a single ready-to-use system?

This is where the role of a Linux distribution (or distro) comes in. Understanding this concept is key to navigating the vast Linux ecosystem with more confidence.

What Is a Distribution (Distro)?

In the Linux ecosystem, the term distribution or often shortened to distro refers to a complete operating system built on top of the Linux kernel. A distribution is not just a kernel, but a comprehensive package consisting of:

• Linux kernel: the core that manages hardware, processes, and memory.
• GNU utilities: a collection of basic programs like ls, cp, bash, and grep from the GNU project.
• Init system: the first program run after the kernel is active, usually systemd in modern distros.
• Package manager: a system for installing, updating, and removing software.
• Desktop environment (optional): a graphical interface such as GNOME, KDE Plasma, or XFCE.
• Default applications: browser, text editor, file manager, and so on.
• Default configuration: initial settings for networking, security, locale, and others.

The distribution maker — whether a commercial company like Red Hat or Canonical, or a volunteer community like the Debian Project — is responsible for selecting these components, compiling them, testing them, and distributing them to users.

An easy analogy is: if the Linux kernel is a car engine, then a distribution is a complete, ready-to-drive car, complete with body, seats, steering wheel, dashboard, and various features that differ depending on the brand. The engine is the same, but the driving experience can be very different.

Components That Distinguish One Distro from Another

All distros use the same Linux kernel (though versions may differ), so the differences lie in the layers above it:

These choices give each distro its own character and personality.

Why Are There So Many Distros?

One of the first things that confuses beginners is why there are so many choices. The DistroWatch site (distrowatch.com), which has tracked Linux distribution development since 2001, lists more than 300 active distributions to date.

The answer is directly related to the open-source nature of Linux itself.

Freedom as the Root of Diversity

The Linux kernel is released under the GNU General Public License (GPL), an open-source license that gives anyone the freedom to:

1. Run the program for any purpose.
2. Study how the program works and modify it.
3. Redistribute copies to others.
4. Distribute modified versions to others.

This freedom means that anyone — individuals, communities, or companies — can take the Linux source code, modify it, and release their own distribution, as long as they comply with the GPL terms.

Different Needs Give Rise to Different Solutions

The diversity of distros is not just a technical phenomenon; it is because users' needs are indeed different:

• Server vs desktop: Server distributions like RHEL or Ubuntu Server are optimised for long-term stability and remote management. Desktop distributions like Ubuntu Desktop or Fedora Workstation prioritise ease of daily use.
• Stability vs cutting-edge: Debian is famous for its very conservative release policy for maximum stability. Arch Linux, on the other hand, follows a rolling release model that always includes the latest version of every piece of software.
• Ease of use vs full control: Ubuntu is designed to be usable by beginners right after installation. Arch Linux requires its users to build the system from scratch, component by component, giving full control along with a steep learning curve.
• Specialised purposes: There are distros designed specifically for digital forensics and cybersecurity (Kali Linux), for system recovery (system rescue), for privacy and anonymity (Tails), and for routers and embedded devices (OpenWrt).
• Philosophy and ideology: Some distros like Trisquel or GNU Guix refuse to include any component that is not completely free software according to the FSF (Free Software Foundation) definition. Other distros take a pragmatic approach by including proprietary firmware and drivers for broader hardware compatibility.

The Linux distro ecosystem is a reflection of the freedom of choice and the diversity of real-world needs.

Linux Distribution Families

Although there are hundreds of distributions, most of them did not emerge from scratch. The majority are derivatives of a few well-established parent distributions. Understanding this family tree is far more useful than trying to memorise distro names one by one.

There are three major families that dominate the Linux ecosystem, determined mainly by the package manager and package format they use.

The Debian/Ubuntu Family: APT and .deb Format

Debian GNU/Linux is one of the oldest Linux distributions still actively maintained today. The Debian project was founded by Ian Murdock on 16 August 1993. The name is a combination of his then-girlfriend Debra and his own name. Debian is run entirely by a volunteer community and is not affiliated with any company.

Debian is known for its commitment to free software, as stated in the Debian Social Contract and the Debian Free Software Guidelines (DFSG). These documents have become a reference for many other open-source projects. In addition, Debian is known for its very careful release cycle. A new version is released only after all packages are deemed sufficiently stable — a process that can take two to three years.

Debian's package management system uses the .deb format and the APT (Advanced Package Tool) package manager, which were inherited by all its derivatives.

Ubuntu is the most influential Debian derivative. Launched in October 2004 by Canonical Ltd., a company founded by South African entrepreneur Mark Shuttleworth, Ubuntu came with a mission to make Linux accessible to everyone. The name Ubuntu comes from a South African Bantu philosophy meaning humanity towards others (I am what I am because of who we all are).

Ubuntu introduced the concept of LTS (Long Term Support) — versions released every two years with five years of security support. This makes it a reliable choice for production environments and users who prioritise stability.

The Ubuntu ecosystem is very broad. Besides the main distribution with GNOME as the default desktop environment, there are various official Ubuntu flavors that use different desktop environments:

• Kubuntu: uses KDE Plasma
• Xubuntu: uses XFCE
• Lubuntu: uses LXQt, designed for older hardware
• Ubuntu MATE: uses MATE Desktop

Many other popular distributions are also Ubuntu-based:

• Linux Mint: very popular among beginners migrating from Windows, with a familiar look
• Pop!_OS: developed by System76, focused on developers and creators
• elementary OS: macOS-inspired interface, emphasising aesthetics and ease of use

The Red Hat/Fedora Family: DNF and .rpm Format

Red Hat is a company founded in 1993 and became one of the pioneers in commercialising Linux. Red Hat popularised a unique business model: the software is open source and free to download, but the company earns revenue from support services, certifications, and enterprise subscriptions.

This model proved very successful. In 2019, IBM acquired Red Hat for 34 billion US dollars, one of the largest software acquisitions in history.

Red Hat's flagship product is RHEL (Red Hat Enterprise Linux), designed for enterprise environments with guaranteed stability and long-term support of up to ten years. RHEL uses the .rpm (Red Hat Package Manager) package format and the DNF (Dandified YUM) package manager.

To test and develop technologies that will later enter RHEL, Red Hat sponsors the community-driven Fedora Project, which launched its distribution in November 2003. Fedora acts as the upstream for RHEL. Innovations that have been tested in Fedora will be adopted into the next RHEL release.

Fedora is always one of the first distros to adopt the latest technologies because of its role as an innovation lab. These technologies include the latest GNOME version, the latest Linux kernel, and Wayland as the default display server.

There are several important RPM-based distributions outside the Red Hat ecosystem:

• CentOS (Community ENTerprise OS): originally a free rebuild of RHEL without branding. In 2021, CentOS changed to CentOS Stream, which is now positioned as the upstream for RHEL.
• Rocky Linux and AlmaLinux: emerged as replacements for classic CentOS, providing binary-compatible, free RHEL rebuilds.
• openSUSE: an independent RPM-based distribution from SUSE (a German company), using the Zypper package manager and a graphical configuration tool called YaST. openSUSE comes in two variants: Leap (fixed release, built from the exact same source and binaries as SUSE Linux Enterprise (SLE) for high stability) and Tumbleweed (rolling release).

The Arch Linux Family: Pacman and Rolling Release

Arch Linux is a distribution born from a very different philosophy. Designed by Judd Vinet and first released in March 2002, Arch is built on two main principles: simplicity and user-centricity.

Simplicity in the context of Arch does not mean easy to use — quite the opposite. Arch does not provide a graphical installer that automatically configures everything. Users must install it manually from the command line, choose every component they want, and configure the system from scratch. The result is a system that truly fits their needs, without bloatware, and the user understands every part of their system.

Arch uses a rolling release model. There is no Arch 1.0 or Arch 2.0. The system is continuously updated, and users always run the latest versions of all software. This is different from fixed-release distros like Ubuntu, which release a new version every six months and an LTS every two years.

Arch's package manager is Pacman. Its ecosystem is enriched by the AUR (Arch User Repository), a community-maintained repository containing thousands of additional packages not available in the official repos.

Arch is a favourite choice for users who want to learn Linux in depth because installing and running it forces you to understand how the system works.

Several Arch-based distributions have emerged to bridge the installation ease without losing Arch's advantages:

• Manjaro: Arch-based with a graphical installer and various desktop environments to choose from during installation.
• EndeavourOS: closer to Arch but with a more user-friendly installer.

Other Notable Distributions

A few distributions deserve mention because of their historical position or unique approach outside the three major families above:

Slackware: Released by Patrick Volkerding on 17 July 1993, Slackware is the oldest Linux distribution still actively maintained today. Its philosophy is very minimalistic and UNIX-like. There is no automatic dependency resolution, and configuration is done manually via text files. Slackware highly values simplicity and consistency, but its learning curve is steep.

Gentoo: First distributed in 2002 and managed by the Gentoo Foundation. Gentoo is a source-based distro, meaning every piece of software is compiled directly from source code on the user's machine. This process allows very specific optimisations through the USE flags system. Users can choose which features to compile and which to leave out. Gentoo is popular among power users who want to understand every detail of their system.

Alpine Linux: A very lightweight distribution based on musl libc (instead of glibc) and BusyBox (instead of GNU utilities). Alpine is very popular in the container world (Docker) because of its small image size. It does not use systemd.

Choosing the Right Distro

With hundreds of choices available, the following guiding questions can help you choose the most suitable distro:

1. What is the primary use case?

• Learning Linux from scratch: Ubuntu, Fedora, or Linux Mint are the best choices. Their documentation is comprehensive, communities are large, and solutions to problems are likely already available.
• Servers and production: RHEL, Ubuntu Server, or RHEL derivatives like Rocky Linux or AlmaLinux. All offer long support cycles that are crucial in server environments.
• Understanding Linux deeply: Arch Linux or Gentoo will force you to understand every layer of the system.
• Specialised purposes: Use distros specifically designed for security, privacy, or embedded needs.

2. How much tolerance do you have for instability?

Rolling-release models like Arch or Fedora always provide the latest software, but occasionally updates may bring unexpected changes or require manual adjustments.

Fixed-release models like Ubuntu LTS or Debian are more conservative. You will not get the newest features, but the system tends to be more stable and predictable.

3. How large is the community and how good is the documentation?

A large community means more tutorials and forum answers. Ubuntu and Fedora have very active communities. The ArchWiki (wiki.archlinux.org) is known as one of the most comprehensive Linux documentations, useful even for users of other distros.

4. Are there specific software or drivers you need?

Some distros make it easier to install proprietary drivers, such as for NVIDIA GPUs, than others. Ubuntu provides an Additional Drivers menu to simplify this process. Fedora is stricter about proprietary software in its official repos, but provides RPM Fusion as an additional repository.

Beginner-Friendly Distros: Ubuntu and Fedora

This series uses two distributions as primary references: Ubuntu 26.04 LTS and Fedora Workstation 44, both freshly released in April 2026. Both are excellent choices for beginners, but with slightly different characteristics. Understanding these differences will help you choose which one suits your needs and personal preferences best.

Ubuntu 26.04 LTS: Resolute Raccoon

Ubuntu 26.04 LTS (Long Term Support) is the version released on 23 April 2026. This version is codenamed Resolute Raccoon. Ubuntu follows the tradition of codenames consisting of two words starting with the same letter, in alphabetical order, and always an animal.

This version receives security support and updates from Canonical for:

• 5 years (until April 2031) for the standard Ubuntu Desktop and Server editions.
• 10 years via the Ubuntu Pro and ESM (Expanded Security Maintenance) programme (until April 2036).
• 15 years via the Legacy add-on (until April 2041).

Key Characteristics of Ubuntu 26.04 LTS

Debian-based. Ubuntu is built on Debian testing or unstable with customisations and additions from Canonical. This means Ubuntu inherits the reliability of the Debian ecosystem while getting a touch of ease from Canonical.

GNOME 50 as default desktop environment. Ubuntu 26.04 LTS includes GNOME 50 (codenamed "Tokyo") customised with the Ubuntu Dock and various Ubuntu-specific visual tweaks. This is also the first LTS version to completely drop X11/Xorg — only the Wayland session is available.

Linux kernel 7.0 and migration to Rust. Ubuntu 26.04 LTS uses Linux kernel 7.0. In line with the memory-safety trend in the Linux ecosystem, several core utilities are starting to be replaced with Rust-based versions, such as sudo-rs (a sudo replacement) and uutils (a partial replacement for GNU coreutils).

APT as the package manager. Besides the very rich official Ubuntu repositories, users can also access PPA (Personal Package Archive) for software not available in the official repos.

Built-in Snap support. Ubuntu integrates Snap, a sandboxed package format developed by Canonical. Some applications are packaged as Snap by default on Ubuntu.

Broad hardware compatibility. Canonical works with many hardware manufacturers (Dell, HP, Lenovo, Framework) to ensure Ubuntu runs well on their devices. The Ubuntu Certified Hardware programme guarantees compatibility on hundreds of laptop and workstation models.

Who Is Ubuntu LTS For?

Ubuntu LTS is a good choice if you:

• Are new to Linux and want a smooth experience with abundant documentation.
• Need a system that is stable for the long term without frequent major upgrades.
• Work in an environment that prioritises compatibility and predictability.

Fedora Workstation 44

Fedora Workstation 44 is the 44th release of the community distribution sponsored by Red Hat. Released on 28 April 2026, Fedora Workstation positions itself as a Linux desktop distribution that always stays at the forefront of Linux technology.

Unlike Ubuntu LTS, Fedora does not have an LTS version. Each Fedora release receives support for about 13 months. This encourages users to upgrade regularly to the latest version.

Key Characteristics of Fedora Workstation 44

Vanilla GNOME 50. Fedora Workstation 44 includes GNOME 50 in its purest form with few modifications. This is one of the best ways to experience GNOME as designed by the GNOME development team.

DNF5 as the package manager. Fedora uses DNF (Dandified YUM) with repositories extendable via RPM Fusion. This community repository provides multimedia codecs and proprietary GPU drivers that are not included in the official Fedora repos. Since Fedora 41, the default implementation is DNF5, a rewrite in C++ (the previous version was Python-based) that is much faster and lighter. In Fedora 44, YUM has been completely removed and DNF5 is the only package manager.

Always including the latest technologies. Fedora is the first distribution to adopt many standard technologies such as Wayland as the default display server, PipeWire as the audio subsystem, systemd, and Btrfs as the default filesystem. Fedora Workstation 44 itself uses Linux kernel 6.19 and also marks the complete removal of the GNOME X11 session, just like Ubuntu 26.04 LTS.

Upstream for RHEL. Features and packages that have been tested in Fedora will be adopted into RHEL. This makes Fedora an innovation lab as well as the earliest path to see the direction of the enterprise Linux ecosystem.

Strict free-software policy in official repos. Fedora does not include proprietary software or legally problematic codecs in its official repositories. This limitation is easily overcome by enabling RPM Fusion.

Who Is Fedora Workstation For?

Fedora is a good choice if you:

• Want to always use the latest versions of GNOME and other Linux technologies.
• Are interested in the Red Hat ecosystem and want to understand the technologies used in enterprise Linux environments.
• Are willing to upgrade the system every six months.
• Want the cleanest GNOME experience with few distributor modifications.

Brief Comparison: Ubuntu 26.04 LTS vs Fedora Workstation 44

Both of these distros are very solid choices for starting your Linux journey. Neither is more correct than the other; the choice depends on your priorities and personal preferences.

The Linux distribution ecosystem may look very broad at first glance. However, behind the diversity there is a simple logic: because Linux is open source, anyone is free to take the same kernel and build a different user experience. There are three major families you should know: Debian/Ubuntu with APT and .deb, Red Hat/Fedora with DNF and .rpm, and Arch Linux with Pacman and the rolling-release philosophy. Most distros you will encounter are derivatives of one of these major families.