Linux Distro Comparison — Trivia & Interesting Facts¶
Surprising, historical, and little-known facts about Linux distributions and their differences.
There are over 600 active Linux distributions¶
DistroWatch tracks over 600 active distributions, but the number of distributions ever created exceeds 1,000. Most are derivatives of just three families: Debian/Ubuntu, Red Hat/Fedora, and Arch. Despite this diversity, over 90% of enterprise Linux deployments use just three distros: RHEL, Ubuntu, and SUSE.
Slackware is the oldest surviving distribution¶
Slackware, created by Patrick Volkerding on July 17, 1993, is the oldest Linux distribution still actively maintained. It predates Debian (August 1993) by about a month. Volkerding has maintained it largely as a one-person project for over 30 years, and it still does not include a dependency-resolving package manager by design.
Red Hat was the first Linux company to reach $1 billion in revenue¶
Red Hat crossed $1 billion in annual revenue in 2012 and was acquired by IBM in 2019 for $34 billion — the largest software acquisition in history at the time. The entire company was built on a product (RHEL) that anyone could rebuild for free, which is exactly what CentOS did until Red Hat hired the CentOS team in 2014.
The CentOS Stream controversy reshaped enterprise Linux¶
In December 2020, Red Hat announced CentOS Linux would become CentOS Stream, a rolling-release upstream of RHEL rather than a free downstream rebuild. This broke thousands of organizations' strategies and spawned AlmaLinux (by CloudLinux) and Rocky Linux (by CentOS co-founder Gregory Kurtzer) within weeks.
Arch Linux's "btw I use Arch" is the most famous Linux meme¶
The "I use Arch btw" meme reflects Arch's reputation as a distribution for enthusiasts who install everything manually. Arch's philosophy — simplicity through transparency, not ease — means users must configure their own system from a minimal base. The Arch Wiki, maintained by this community, has become the best Linux documentation resource, used even by non-Arch users.
Alpine Linux's entire base install is under 5 MB¶
Alpine Linux, originally designed for routers and embedded systems, uses musl libc and BusyBox instead of glibc and GNU coreutils. Its minimal Docker image is about 5 MB compared to Ubuntu's 75 MB. This made Alpine the default base image for Docker containers, though musl compatibility issues (especially with DNS resolution and locale) have pushed some projects back to Debian-slim.
Gentoo compiles everything from source — and there is a reason¶
Gentoo's Portage system compiles every package from source code with user-specified optimization flags (USE flags). While this sounds impractical, it allows fine-grained control: you can build Firefox without PulseAudio, or PostgreSQL with specific extensions. The name comes from the Gentoo penguin, the fastest swimming penguin species.
NixOS uses a purely functional package manager¶
NixOS, based on the Nix package manager created by Eelco Dolstra in his 2006 PhD thesis, treats system configuration as a pure function. Every package version coexists without conflicts, rollbacks are instant, and the entire system is defined in a single configuration file. This radical approach influenced Guix, Docker, and the immutable infrastructure movement.
Ubuntu controls about 50% of cloud Linux instances¶
Despite RHEL's enterprise dominance on bare metal, Ubuntu leads in cloud deployments. Canonical's early focus on cloud images for AWS, GCP, and Azure gave Ubuntu a first-mover advantage. As of recent estimates, Ubuntu runs on roughly half of all Linux cloud instances worldwide, making it the de facto cloud operating system.
Fedora is Red Hat's proving ground¶
Every major RHEL feature was tested in Fedora first: SELinux, systemd, PipeWire, Wayland, Btrfs (later reverted to XFS), and GNOME as default desktop. Fedora releases every ~6 months with cutting-edge packages. Each RHEL major version is forked from a Fedora release (RHEL 9 came from Fedora 34) and then stabilized for a decade.
Linux Mint exists because of one controversial decision¶
Linux Mint was created in 2006, but its popularity exploded after Ubuntu switched to the Unity desktop in 2011. Millions of users who disliked Unity migrated to Mint, which offered a traditional desktop experience via Cinnamon (its custom GNOME fork). Mint has consistently ranked in the top 3 on DistroWatch ever since.
Immutable distros are the newest frontier¶
Fedora Silverblue, openSUSE MicroOS, Vanilla OS, and Universal Blue represent a new paradigm: the root filesystem is read-only and atomically updated. Applications run in containers (Flatpak, Podman). This approach, inspired by ChromeOS and CoreOS, makes systems nearly impossible to break through misconfiguration. It may be the future of desktop Linux.