We are trying to upgrade the machine image we use for the Micrometer build from ubuntu-2404:2025.09.1 to ubuntu-2404:2026.02.2. However, the job fails to run with an error message like the following: Job was rejected because resource class medium, image ubuntu-2404:2026.02.2 is not a valid resourc…

Hi @shakuzen I just had the same experience. It appears that the image was renamed. Check the current list of available images on CircleCI Developer - Machine Imagesubuntu-2404 - CircleCI . I had success with ubuntu-2404:2026.02.20 machine-agent version 1.0.121027-1c678a53 (image: “ubuntu-2404:20…

Hi, these image names were meant to be internal and weren’t intended to be used directly, they got picked up by our indexer when they shouldn’t have. They’re designed to be called via the docker-docker29 alias rather than by name. The image will still be able to be used directly using ubuntu-2404:20…

@ahmedwab Thank you for clarifying about the new images! ubuntu-2404:2026.02.20 is actually a very useful update, since it bumps Docker from 28.x to 29.x and it updates Ubuntu from 24.04.3 to 24.04.4 LTS. Would it be possible to officially release this image, or perhaps an image with a 2026.03.1 …

workflows: version: 2 build_test_and_deploy: jobs: - build: context: org-global

Hi @MikeMcC399 , The intention is to wait for the new 26.04 machine before making an official release. In the meantime, you can continue using ubuntu-2404:2026.02.20 directly as it’s still available. To clarify my earlier comment: when I said “internal,” I meant the image was designed to be accesse…

Hi @ahmedwab Did I understand you correctly that there will be a new ubuntu-2404 release when Ubuntu 26.04 is available? Does that mean you are also planning to release an ubuntu-26.04 image? I’m seeing Ubuntu 26.04 LTS (Resolute Raccoon) planned for release on April 23, 2026 with a beta release …

Yes, that’s the plan! The intention is to release both a new ubuntu-2404 image and a new ubuntu-2604 image once Ubuntu 26.04 is available.

Ubuntu 26.04 was released on April 23, 2026 and is now available . Do you have any planning dates for CircleCI now?

Hey, Yes, we are currently working on it. I will update this thread as soon as I am done.

Job rejected due to not a valid resource class with machine image ubuntu-2404:2026.02.2

Feedback & Bug Reports

ahmedwab May 13, 2026, 2:20pm 11

Hey Mike,

New images are now available. You can take a look at this post Ubuntu 22.04, 24.04, 26.04 - Q2 2026 Edge Release (Including CUDA).

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Job rejected due to not a valid resource class with machine image ubuntu-2404:2026.02.2

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