Why Debian and Ubuntu Split: Wetin Change?

Why Debian and Ubuntu split

Debian and Ubuntu split for 2004 because of release calendar, no be because of code. Debian dey release stable version when im release team judge say e ready. Ubuntu promise say e go release new version every six months for date wey dem don set ahead, so e take copy from Debian development branch, freeze am, repair wetin spoil, then release am.

Twenty-two years later, both still dey share package format and the tools wey manage am, and most packaging work behind dem na one job wey dem do once. Wetin dem no share na schedule, support contract, or one agreement about wetin suppose dey inside default install. Na this distinction dey useful when you dey choose operating system for server, because e separate differences wey na just appearance from the ones wey fit cost you one afternoon.

Wetin Ubuntu come from

Ian Murdock start Debian Project on 16 August 1993. By 2004, Debian na the biggest distribution wey volunteers dey run for the whole world, and e dey slow. Debian 3.0 "woody" release happen on 19 July 2002, but the next one, Debian 3.1 "sarge", no come out until 6 June 2005. Almost three years pass between two stable releases. During that period, anybody wey want current software for Debian server no get supported solution from Debian itself.

For April 2004, Mark Shuttleworth invite about twelve Debian developers come him flat for London to plan Debian-based system wey go follow fixed schedule, and e start Canonical Ltd to employ dem. The first release, Ubuntu 4.10 "Warty Warthog", come out six months later on 20 October 2004. The version number na the release date: 4.10 mean October 2004, and 26.04 mean April 2026.

Ubuntu no ever be fork for the normal meaning. Fork dey copy codebase once, then e separate from the original project. Ubuntu dey copy Debian again for every cycle. E dey take packages from Debian unstable, the rolling branch wey Debian call sid, and e dey refresh that copy automatically during the first weeks of every Ubuntu cycle. After import freeze, Ubuntu developer must pull every later package across by hand and explain why e follow the freeze rules. The bigger family tree of Linux distributions get plenty real forks. This one no be fork. Na permanent downstream project.

Wetin the two projects still get in common

The part wey dem share big pass the part wey different. Both dey use the .deb package format with dpkg underneath and apt on top, and both follow Debian Policy for where files go and how packages declare their dependencies. Ubuntu own developer documentation talk say about four out of five source packages wey Ubuntu copy from Debian no get any modification at all. When maintainer fix bug for Debian, e dey fix am for Ubuntu users too, usually without either side noticing.

When Ubuntu change package, the version string show am. Debian own 1.2.3-4 become 1.2.3-4ubuntu1, and that suffix mark the local change, wey both projects call the delta. Ubuntu publish the complete delta for every package wey e touch and forward patches to Debian package tracking system, so Debian maintainer fit see wetin downstream do and take am if dem want.

People don argue whether this one enough since 2005, and e make sense to state the argument plainly instead of choosing side. From Debian side, the complaint na about where the work dey go: Canonical dey pay people to work downstream, downstream dey collect the users and attention, and sending fix back upstream na extra work wey nobody dey pay for. From Ubuntu side, six-month deadline no fit match project wey no get deadline, so waiting for Debian no always be option. Both statements dey true. But none of dem don ever stop the packages from flowing.

Release wey ready, based on date for calendar

Debian release date na outcome, no be promise. Debian 12 "bookworm" release for 10 June 2023, and Debian 13 "trixie" release for 9 August 2025, roughly two years apart, but nothing guarantee say the next gap go be the same. The current testing branch na "forky", and e never get release date, because Debian no dey announce one until release-critical bug count show say e fit release.

For Ubuntu, date na the promise. New release dey come every six months, and every fourth one, for April of even-numbered year, na LTS (long term support) release. Ubuntu 26.04 LTS "Resolute Raccoon" release for 23 April 2026, as scheduled. The releases wey dey between dem na interim releases, and dem get only nine months of updates. Na why dem no belong for server wey you no wan rebuild twice every year. The choice between Ubuntu LTS and interim releases on a server depend on that nine-month number.

The cadence set your upgrade calendar, and na this be the most practical result of the difference. For Ubuntu LTS, you know years ahead say your next in-place upgrade go land for April of an even year. So, the upgrade from Ubuntu 24.04 to 26.04 fit don plan before 26.04 exist. For Debian, you monitor the freeze announcements and schedule the work when the release actually happen.

Wetin LTS change

Ubuntu 6.06 LTS "Dapper Drake" release for 1 June 2006, and na the first LTS be that. Before then, Ubuntu na fast-moving system wey dey replace itself two times every year, and business no dey use that kind system build production server. LTS do one important thing: e put support end date for future, far enough make person fit build plan around am. Na this change make Ubuntu become the default server distribution. The six-month cadence dey support am because each LTS dey use work wey don already pass through testing for the interim releases before am.

Debian reach the same place from another direction. Its stable release already dey move slowly, and the Debian LTS project extend the supported life of each release after Debian own security team step back.

Who dey support you, and for how long

[
  {
    "label": "Debian stable",
    "support_duration": 3
  },
  {
    "label": "Debian LTS",
    "support_duration": 5
  },
  {
    "label": "Debian ELTS, paid",
    "support_duration": 10
  },
  {
    "label": "Ubuntu LTS",
    "support_duration": 5
  },
  {
    "label": "Ubuntu Pro ESM",
    "support_duration": 10
  },
  {
    "label": "Ubuntu Pro plus Legacy",
    "support_duration": 15
  }
]

Debian own security team dey cover one stable release for 3 years. After that, Debian LTS team, wey Debian describe as group of volunteers and companies instead of its official security and release teams, dey carry am reach 5 years. You fit see this handover for the current dates: bookworm enter LTS on 11 June 2026 and coverage dey reach 30 June 2028, while bullseye LTS period go end on 31 August 2026. After that point, Freexian dey sell Extended LTS, or ELTS, reach 10 years, but na only the packages wey paying customers actually use dem dey cover.

Ubuntu LTS dey get 5 years of standard security maintenance from Canonical. Ubuntu Pro subscription dey increase am to 10 years through ESM (expanded security maintenance), for both main and universe. Legacy add-on dey extend am reach 15. As of August 2026, Ubuntu Pro free for personal use on up to five machines, so for one VPS, the ten-year figure real without purchase order. Pro also include livepatch service. Na the supported way to do live kernel patching for one VPS without reboot for every kernel security update.

The structure behind these numbers matter pass the numbers themselves. With Ubuntu, you buy support from the same company wey build the distribution. With Debian, no such company dey, so paid support fit come from third party like Freexian, your hosting provider, or your own team.

Init systems, and the vote wey end the argument

The biggest technical difference na init system, the first process wey kernel start and the supervisor for every service after that. Ubuntu 6.10 "Edgy Eft", wey release on 26 October 2006, ship Upstart, wey Canonical write. Debian remain on sysvinit for years while the argument continue. Debian Technical Committee settle the matter with vote wey conclude on 11 February 2014. The chair casting vote decide in favour of systemd for Debian 8.

Ubuntu follow within days. Shuttleworth post about the decision, wey get title "Losing graciously", explain the reason plainly: Ubuntu na central member of Debian family, so e go adopt the outcome. Ubuntu 15.04 ship systemd by default on 23 April 2015, and Debian 8 "jessie" do the same on 26 April 2015, three days later.

Na that convergence make most service tutorials move between the two without edits. Unit files, systemctl and journalctl behave the same for both. Debian 13 ship systemd 257 and Ubuntu 26.04 LTS ship systemd 259, so the thing wey separate dem there na version number, no be design.

Snap, and the part wey no port

Ubuntu 16.04 LTS introduce snap packages for 2016, and 18.04 na the first release wey deliver some default applications as snaps. Snap na self-contained bundle wey carry im own copies of dependencies, so upstream project fit push new version go every supported Ubuntu release at once instead make e wait for the archive to catch up.

The reason why no other major distribution adopt snaps as default no be the format. The snapd client dey talk to one store, wey Canonical operate, and the server side of that store no be open source. Any distribution wey adopt snaps dey hand part of im software distribution to another vendor. Debian no do am, and e no install snapd by default.

Na for here upstream instructions quietly stop to work. Certbot na the clearest example: im own documentation recommend say make you install am from snap, and e warn say distribution packages "tend to rapidly fall out of date on LTS-style distributions". If you follow that page for Ubuntu, e go work. If you follow am for stock Debian server, the very first step no get anything to run am. Our own Certbot guide for Nginx on Ubuntu 24.04 dey use the distribution package because of that.

Kernels, firmware and the non-free question

Debian Social Contract and DFSG (Debian free software guidelines) define wetin fit enter main. Everything wey no meet am go contrib and non-free. For most part of Debian history, this one include binary firmware blobs wey normal network and storage hardware need before dem go work. After General Resolution for 2022, Debian 12 add separate non-free-firmware archive area. Official installer images don carry that firmware since then.

Ubuntu make the opposite decision from day one. E archive divide into main and restricted, wey Canonical support and wey include proprietary drivers. E also get universe and multiverse, wey community dey maintain. For VPS, the effect small because virtual hardware almost no need firmware. For dedicated hardware, na the difference between network card wey come up and one wey no come up.

Kernels dey differ for the same reason. As of August 2026, Ubuntu 26.04 LTS dey ship Linux 7.0, while Debian 13 dey ship Linux 6.12. Ubuntu still dey move kernel forward inside one LTS through e hardware enablement stacks. Debian dey keep one kernel series for the whole life of stable release and dey provide newer ones through backports. Newer kernel mean better support for recent virtio devices and filesystems. Older one mean the behaviour wey you test for January still be the behaviour wey you go get for December.

Wetín go break when you follow instruction for the other one

Most times, guide wey dem write for one fit work for the other one. The failures dey happen for some known places.

• Third-party apt repositories dey publish for specific distribution and codename. Vendor wey support noble and jammy fit no publish anything for trixie. The failure go look like network fault instead of policy decision.
• Launchpad PPAs dey build for only specific Ubuntu series. If you add one to Debian, e go pull binaries wey link against Ubuntu library versions. E fit work by luck, or e fit drag plenty part of Ubuntu runtime enter your system.
• Anything wey assume say snapd, Ubuntu Pro subscription, or Canonical's livepatch dey available no get Debian equivalent step. So you need replace those sections of the guide instead of adapting dem.
• Default images dey differ for the user wey you log in as. Ubuntu images normally give you a ubuntu user with sudo and no root password. Debian images normally give you a debian user. Provider images fit differ. Check your own image before you change anything about SSH.

When repository no get suite for your release, apt go talk am clearly:

E: The repository 'https://download.example.com/linux/debian forky Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.

That message mean say vendor never publish packages for your codename. The mirror no spoil, and retry no go fix am. Either vendor support your release or e no support am.

So which one you suppose run?

Choose Ubuntu LTS if you want upgrade date wey you fit put for calendar years ahead, plus one vendor wey you fit buy support from. Choose Debian stable if you want smaller default install without one company dey for the middle, plus base wey dey change slowly enough to remain predictable.

Everything else dey transfer. Both use apt, both follow Debian Policy, and both run the same applications from the same package format, so the skills go follow you. If you dey come from Red Hat or Fedora instead, the dnf and apt command equivalents go help you translate between both directions. And if you dey compare these two with the other images wey dey available during deployment, our guide to choosing operating system for your VPS put dem side by side with the rest of the list.

FAQ

Ubuntu na fork of Debian?

No. Fork dey copy codebase once, then e dey maintain am separately from that time. Ubuntu dey re-import from Debian unstable for start of every six-month cycle, and Ubuntu developer documentation talk say roughly four out of every five source packages dem copy without modification. Ubuntu na permanent downstream of Debian. Na why Debian packaging knowledge still work for Ubuntu without change, and why fix wey dem make for Debian usually reach Ubuntu users without extra work from anybody.

Ubuntu tutorials dey work for Debian?

Most times, yes, and the exceptions dey predictable. Both use apt, both use systemd, and both follow Debian Policy, so package management and service management match. Wetin dey break na anything wey depend on Canonical infrastructure: snap-based install steps, Launchpad PPAs, Ubuntu Pro commands, and third-party apt repositories wey publish only for Ubuntu codenames. When repository no get suite for your release, apt report say it "does not have a Release file". This mean say vendor never build am for your codename.

How long Debian and Ubuntu security updates dey last?

Ubuntu LTS get 5 years of standard security maintenance from Canonical, 10 with Ubuntu Pro subscription, and up to 15 with Legacy add-on. Debian stable release get 3 years from Debian security team and 5 years when you include the LTS period wey follow. Freexian paid Extended LTS reach 10 years, but na only for the packages wey their customers request.

Which one better for server, Debian or Ubuntu?

Neither one better generally, and the honest difference na schedule and support. Ubuntu LTS good for server wey upgrade date must dey predictable and where support must fit come from one vendor. Debian stable good for server where smaller default install and slower rate of change matter pass fixed calendar. Dem dey run the same software from the same package format, so the choice no limit wetin you fit host.