ubuntu.com llms.txt
In short
ubuntu.com serves a 13 KB llms.txt with 12 H2 sections and 65 links, graded A on the llmstxt.org structure (6 of 6 checks). It passes every check. Whether the home page links it was not tested. An llms-full.txt is served too. Read 4 November 2026.
llms.txt 13 KB, 105 lines
# Ubuntu
> Ubuntu is the world's most popular Linux operating system, published by Canonical. It runs from the desktop to the cloud, to containers and IoT devices. Ubuntu LTS releases receive five years of free security updates, extendable to up to 15 years with Ubuntu Pro.
## Main pages
- [About Ubuntu](https://ubuntu.com/about?format=md): Ubuntu is an open source operating system for desktops, servers, IoT devices, and the cloud. It is developed by Canonical with a global community of contributors.
- [Ubuntu releases](https://ubuntu.com/about/release-cycle?format=md): Ubuntu's release cycle, including LTS (Long Term Support) and interim releases, with details on support timelines and upgrade paths.
- [Blog](https://ubuntu.com/blog?format=md): The latest news and technical articles from Ubuntu, covering releases, security advisories, engineering insights, and community updates.
- [Community](https://ubuntu.com/community?format=md): How to get involved with the Ubuntu community, contribute to development, join governance, and participate in events like Ubuntu Summit.
- [Ubuntu tutorials](https://ubuntu.com/tutorials?format=md): Step-by-step guides covering installation, server setup, cloud deployment, security, IoT, and more.
- [Ubuntu documentation](https://documentation.ubuntu.com/): The documentation directory for all Ubuntu operating systems and products.
## Download
- [Download Ubuntu](https://ubuntu.com/download?format=md): Download Ubuntu Desktop, Ubuntu Server, Ubuntu Core, and Ubuntu flavors.
- [Download Ubuntu Desktop](https://ubuntu.com/download/desktop?format=md): Download the latest version of Ubuntu Desktop for PCs and laptops.
- [Download Ubuntu Server](https://ubuntu.com/download/server?format=md): Download the latest version of Ubuntu Server for data centers and scale-out workloads.
- [Download Ubuntu for public cloud](https://ubuntu.com/download/cloud?format=md): Optimized and certified Ubuntu images for public clouds including AWS, Azure, Google Cloud, IBM Cloud, and Oracle Cloud.
- [Download Ubuntu Core](https://ubuntu.com/download/core?format=md): Download or build Ubuntu Core images for IoT and embedded devices, with the strictly confined version of Ubuntu.
- [Minimal Ubuntu](https://ubuntu.com/download/minimal?format=md): Small-footprint Ubuntu images optimized for automated deployment on public clouds and as a base for container images.
- [Alternative downloads](https://ubuntu.com/download/alternative-downloads?format=md): Torrents, network installers, local mirrors, past releases, and alternative architectures for Ubuntu.
## Ubuntu Desktop
- [Ubuntu Desktop](https://ubuntu.com/desktop?format=md): Ubuntu Desktop for developers, organizations, and everyday users offers a securely designed, customizable Linux desktop experience.
- [Ubuntu Desktop features](https://ubuntu.com/desktop/features?format=md): Key features of Ubuntu Desktop, including its application ecosystem, security, and accessibility.
- [Ubuntu Desktop for developers](https://ubuntu.com/desktop/developers?format=md): Ubuntu as a development platform, with native toolchains, container support, and GPU acceleration for AI/ML workloads.
- [Ubuntu Desktop for organizations](https://ubuntu.com/desktop/organizations?format=md): Ubuntu Desktop for enterprise deployment, with Active Directory integration, fleet management via Landscape, and compliance tooling.
- [Ubuntu flavors](https://ubuntu.com/desktop/flavors?format=md): Community-maintained variants of Ubuntu Desktop, including Kubuntu, Xubuntu, Lubuntu, Ubuntu MATE, Ubuntu Budgie, Ubuntu Cinnamon, Ubuntu Studio, Ubuntu Unity, and Edubuntu.
- [Ubuntu on WSL](https://ubuntu.com/desktop/wsl?format=md): Run Ubuntu as a Windows Subsystem for Linux instance, with access to the full Ubuntu terminal and toolchain on Windows.
- [Ubuntu Desktop documentation](https://documentation.ubuntu.com/desktop/): Documentation for Ubuntu Desktop, covering installation, configuration, accessibility, and the desktop environment.
## Ubuntu Server
- [Ubuntu Server](https://ubuntu.com/server?format=md): Ubuntu Server for data centers, cloud, and scale-out workloads, with five years of free security updates extendable to 15 years with Ubuntu Pro.
- [Ubuntu Server documentation](https://documentation.ubuntu.com/server/): Documentation for Ubuntu Server, covering installation, configuration, security, networking, and virtualization.
## Cloud
- [Ubuntu on public clouds](https://ubuntu.com/cloud/public-cloud?format=md): Ubuntu is the most widely used OS on major public clouds, with optimized images for AWS, Azure, Google Cloud, IBM Cloud, and Oracle Cloud.
- [Ubuntu on private clouds](https://ubuntu.com/cloud/private-cloud?format=md): Build private clouds with Ubuntu and OpenStack, with support from Canonical.
- [Ubuntu cloud images](https://cloud-images.ubuntu.com/): Standard and minimal Ubuntu images for cloud deployments and virtual machines.
- [Ubuntu public cloud documentation](https://documentation.ubuntu.com/public-cloud/): Documentation for Ubuntu on public clouds, covering optimized images, cloud-init, and deployment on AWS, Azure, Google Cloud, and more.
## IoT and devices
- [Ubuntu for IoT](https://ubuntu.com/internet-of-things?format=md): Use Ubuntu for IoT, from smart devices to industrial gateways, with long-term security maintenance and fleet management.
First 48 of 105 lines.
Parse graded A, 6 of 6
file: https://ubuntu.com/llms.txt
Ubuntu
Ubuntu is the world's most popular Linux operating system, published by Canonical. It runs from the desktop to the cloud, to containers and IoT devices. Ubuntu LTS releases receive five years of free security updates, extendable to up to 15 years with Ubuntu Pro.
12 sections, 65 links, no Optional section.
Ora's cached score: 55, grade C, scanned 29 August 2026.
The parse
ubuntu.com lists 65 links: 64 point at ubuntu.com or a relative path, 1 point elsewhere. The hosts it links most: ubuntu.com (57), documentation.ubuntu.com (6), cloud-images.ubuntu.com (1), snapcraft.io (1).
| H2 section | Links |
|---|---|
| Main pages | 6 |
| Download | 7 |
| Ubuntu Desktop | 7 |
| Ubuntu Server | 2 |
| Cloud | 4 |
| IoT and devices | 7 |
| Ubuntu Pro | 8 |
| Landscape | 3 |
| Security and compliance | 8 |
| Identity management | 3 |
| Hardware | 9 |
| Contact and support | 1 |
Grade against the llmstxt.org structure
The file passes all six checks. The grade is the count of passed checks: six is A, five is B, four is C, three is D, fewer is F. It measures structure only. Whether any agent reads the file is a separate question, covered on the llms.txt reference.
| Check | Result | Detail |
|---|---|---|
| Starts with an H1 naming the site or project | Pass | H1: Ubuntu |
| Has a blockquote summary under the H1 | Pass | Blockquote summary found. |
| Has at least one H2 section that lists links | Pass | 12 H2 sections, 12 with links. |
| At least 80 percent of links point at the same site | Pass | 64 of 65 links stay on ubuntu.com (98 percent). |
| Under 100 KB | Pass | 12879 bytes as served. |
| Plain markdown, no HTML | Pass | No HTML document markers in the body. |
Ora's cached score
Ora's cached report for ubuntu.com gives it 55 of 100, grade C, scanned on 29 August 2026. Its Access layer, which holds the read-layer checks below, scored 40 of 57 check points. Read from GET ora.ai/api/score/ubuntu.com on 5 November 2026. The score is Ora's, not this site's, and the structure grade above is a different measure: it grades the llms.txt file against the llmstxt.org proposal, while Ora's score covers the whole site. Ora's report for ubuntu.com has every layer.
| Ora check (Access layer) | Result | Points |
|---|---|---|
| Sitemap exists | Pass | 2 of 2 |
| Content without JavaScript | Pass | 3 of 3 |
| Not blocked by bot detection | Pass | 2 of 2 |
| Markdown URL fallback | Fail | 0 of 2 |
| llms.txt exists | Pass | 1 of 1 |
| llms.txt formatting | Pass | 2 of 2 |
| JSON-LD structured data | Partial | 2 of 4 |
| Metadata completeness | Pass | 2 of 2 |
| llms.txt links resolve | Pass | 2 of 2 |
| Markdown alternate link | Fail | 0 of 1 |
| Redirect hygiene | Pass | 1 of 1 |
| Page token budget | Pass | 1 of 1 |
| Code fence validity | Pass | 1 of 1 |
| Content behind auth | Not applicable | 0 of 2 |
| OpenAPI spec published | Fail | 0 of 7 |
| Markdown agent docs | Fail | 0 of 1 |
| Markdown negotiation with Vary | Fail | 0 of 1 |
| Markdown for agent user agents | Fail | 0 of 1 |
| Agent crawler reachability | Pass | 2 of 2 |
Linking and the companion file
The crawl did not read this home page, so the link was not tested. Ora's lab found (2026-10-19) that 86 percent of llms.txt fetches by agents arrived through a link, so an unlinked file is mostly a file nobody opens. An llms-full.txt is served at the same root.
How it compares
At 13 KB the file is larger than 66 percent of the 2,529 plain-text llms.txt files in this edition, and its 65 links put it ahead of 69 percent of them on link count. The home page declares no generator. Size bucket: 10 to 50 KB. Tranco rank 167. Category: Top 10,000, no category.
Live file: https://ubuntu.com/llms.txt. Read 4 November 2026. If the file has since changed or gone, the live URL is the authority; this page records what the crawl read on that date.
Sources
- ubuntu.com llms.txt https://ubuntu.com/llms.txt, read 4 November 2026
- llms.txt proposal (llmstxt.org) https://llmstxt.org/, read 4 November 2026
- Tranco list 746WX (crawl universe) https://tranco-list.eu/list/746WX, read 4 November 2026
- Ora: AgentReady launch post (the 86 percent finding) https://ora.ai/blog/agentready-launch, read 4 November 2026
- Ora llms.txt (GET /api/score/{domain} looks up a cached score) https://ora.ai/llms.txt, read 5 November 2026
Last reviewed 5 November 2026