✨ Init Ubuntu 26 - New release Resolute by Whisper40 · Pull Request #1987 · kubernetes-sigs/image-builder

Whisper40 · 2026-04-23T13:03:14Z

Change description

The goal of this PR is to initiate the work for Ubuntu 26.

Is this change including a new Provider or a new OS? (y/n) yes
If yes, has the Provider/OS matrix been updated in the readme? (y/n) yes
If adding a new provider, are you a representative of that provider? (y/n) no

Related issues

Fixes #

Additional context

k8s-ci-robot · 2026-04-23T13:03:25Z

Hi @Whisper40. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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Whisper40 · 2026-04-23T13:12:53Z

i'm waiting the "ok-to-test" to start debugging :)

AndiDog · 2026-04-24T07:54:25Z

/ok-to-test

Whisper40 · 2026-04-24T09:01:35Z

/retest

Whisper40 · 2026-04-24T11:47:15Z

/retest

Whisper40 · 2026-04-24T11:50:25Z

/retest

Whisper40 · 2026-04-24T12:20:19Z

/retest

Whisper40 · 2026-04-24T12:41:37Z

/retest

Whisper40 · 2026-04-24T13:46:10Z

Azure pull failing due to Ubuntu 26.04 not available on Azure..
https://az-vm-image.info/?cmd=--offer+ubuntu

Whisper40 · 2026-04-24T14:25:04Z

/retest

Whisper40 · 2026-04-24T14:45:04Z

/retest

Whisper40 · 2026-04-24T15:03:20Z

@AndiDog Hi, the CI is actually not failing due to Ubuntu26 but Photon5

almalinux-9: SUCCESS
ubuntu-2404: SUCCESS
ubuntu-2604: SUCCESS
rockylinux-9: SUCCESS
flatcar: SUCCESS
photon-5: FAILED. See logs in the artifacts folder.
ubuntu-2204: SUCCESS

For Azure failure :
Azure pull failing due to Ubuntu 26.04 not available on Azure..
https://az-vm-image.info/?cmd=--offer+ubuntu

AndiDog

Apart from inline comments, docs/book/src/capi/providers/maas.md says

The image will be located in images/capi/output/BUILD_NAME+kube-KUBERNETES_VERSION. Replace xxxx with 2204 or 2404, depending on the Ubuntu version.

From the PR diff, I guess 2604 should also be available. Let's remove the mention of the very old 2204 in that file as well.

There should be official builds since April 23rd (yesterday), let's try removing the beta parts.

This is based on a deep AI review, btw. I didn't find the time yet to check this out myself.

Would you mind telling us which images you tried building yourself, and ran them successfully on a Kubernetes cluster? If any... no worries if that didn't happen yet 😉.

Whisper40 · 2026-04-27T09:42:10Z

@AndiDog Check this link, Ubuntu 26 is not available for Azure. The beta part has been removed for few days

Whisper40 · 2026-04-27T09:42:15Z

/retest

Whisper40 · 2026-04-27T09:49:57Z

/retest

Whisper40 · 2026-04-27T11:50:20Z

/retest

Whisper40 · 2026-04-27T12:22:34Z

/retest

Whisper40 · 2026-04-27T13:06:30Z

/retest

Whisper40 · 2026-04-27T13:11:24Z

/retest

Whisper40 · 2026-04-27T13:13:06Z

@AndiDog The CVM image for Ubuntu 26 is not yet available on Azure, it's why it is failing actually.

Whisper40 · 2026-05-21T08:54:23Z

/retest

Whisper40 · 2026-05-26T13:37:34Z

/retest

Whisper40 · 2026-05-27T07:48:39Z

It is now OK for me ! @AndiDog @mboersma

mboersma

Looking good, thanks for doing this! I had a couple comments, plus @AndiDog had a comment about the Vultr OS ID.

mboersma · 2026-05-27T14:22:47Z

+build-azure-sig-ubuntu-2604-gen2: ## Builds Ubuntu 26.04 Gen2 managed image in Shared Image Gallery
 build-azure-sig-ubuntu-2204-cvm: ## Builds Ubuntu 22.04 CVM managed image in Shared Image Gallery
 build-azure-sig-ubuntu-2404-cvm: ## Builds Ubuntu 24.04 CVM managed image in Shared Image Gallery
+#build-azure-sig-ubuntu-2604-cvm: ## Builds Ubuntu 26.04 CVM managed image in Shared Image Gallery


Is this target commented out because it's not working?

It is commented out because ubuntu-2604-cvm is not available on azure yet

Whisper40 · 2026-05-28T09:06:13Z

/retest

Whisper40 · 2026-05-28T09:15:21Z

/retest

k8s-ci-robot · 2026-05-28T09:22:51Z

@Whisper40: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-goss-populate	`1317b58`	link	true	`/test pull-goss-populate`

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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Whisper40 · 2026-05-29T11:44:11Z

/retest

Whisper40 · 2026-05-29T13:35:52Z

@mboersma Ready to merge ?

mboersma

I think this is the last thing remaining: "2260" isn't a valid ID for vultr os list, should be "2760" (Ubuntu 26.04 LTS x64) according to @AndiDog.

- Update Makefile, azure_targets.sh, init-sig.sh with ubuntu-2604 targets - Disable Azure Ubuntu 26 CVM target (not available yet) - Replace deprecated apt_key with signed-by keyring approach (all roles) - Map Azure CLI codename resolute->noble (no MS repo for 26.04 yet) - Set QEMU memory to 4GB for Ubuntu 26.04 - Update README.md and all provider docs - Fix sysctl path for Ubuntu 26.04 (systemd 259 no longer loads /etc/sysctl.conf) - Stop background apt services to prevent race conditions during build

mboersma

/lgtm
/approve

Thanks so much @Whisper40! This is an important addition.

k8s-ci-robot · 2026-06-03T15:10:32Z

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mboersma

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k8s-ci-robot requested review from CecileRobertMichon and chrischdi April 23, 2026 13:03

k8s-ci-robot added the needs-ok-to-test Indicates a PR that requires an org member to verify it is safe to test. label Apr 23, 2026

k8s-ci-robot added size/XXL Denotes a PR that changes 1000+ lines, ignoring generated files. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. labels Apr 23, 2026

Whisper40 marked this pull request as draft April 23, 2026 13:07

k8s-ci-robot added the do-not-merge/work-in-progress Indicates that a PR should not merge because it is a work in progress. label Apr 23, 2026

k8s-ci-robot added ok-to-test Indicates a non-member PR verified by an org member that is safe to test. and removed needs-ok-to-test Indicates a PR that requires an org member to verify it is safe to test. labels Apr 24, 2026

AndiDog reviewed Apr 24, 2026

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Comment thread images/capi/packer/vultr/ubuntu-2604.json Outdated

Whisper40 force-pushed the try-ubuntu26 branch from 5f2954f to 5f78093 Compare May 27, 2026 06:34

k8s-ci-robot added the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label May 27, 2026

Whisper40 force-pushed the try-ubuntu26 branch from 5f78093 to 9b5fbf0 Compare May 27, 2026 06:46

k8s-ci-robot removed the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label May 27, 2026

mboersma requested changes May 27, 2026

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Whisper40 force-pushed the try-ubuntu26 branch from 9b5fbf0 to 4888370 Compare May 27, 2026 14:33

k8s-ci-robot added the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label May 27, 2026

Whisper40 force-pushed the try-ubuntu26 branch from 4888370 to 6b664e1 Compare May 28, 2026 08:15

k8s-ci-robot removed the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label May 28, 2026

mboersma requested changes Jun 2, 2026

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Comment thread images/capi/packer/vultr/ubuntu-2604.json Outdated

Whisper40 force-pushed the try-ubuntu26 branch from 6e0556a to 97fbb77 Compare June 3, 2026 12:35

Whisper40 requested a review from mboersma June 3, 2026 13:44

mboersma approved these changes Jun 3, 2026

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k8s-ci-robot assigned mboersma Jun 3, 2026

k8s-ci-robot added the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Jun 3, 2026

k8s-ci-robot added the approved Indicates a PR has been approved by an approver from all required OWNERS files. label Jun 3, 2026

k8s-ci-robot merged commit bbdede9 into kubernetes-sigs:main Jun 3, 2026
13 checks passed

mboersma mentioned this pull request Jun 3, 2026

Add initial support for Oxide. #2023

Merged

This was referenced Jun 9, 2026

Ubuntu 2404 cloud-image #2016

Open

Fix Ubuntu 26.04 Azure build: drop stale Microsoft 18.04 apt source elastx/image-builder#3

Open

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Change description

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