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Update mirror.gcr.io/library/ubuntu Docker tag to v26 - #14492

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Update mirror.gcr.io/library/ubuntu Docker tag to v26#14492
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This PR contains the following updates:

Package Type Update Change
mirror.gcr.io/library/ubuntu (source) final major 24.0426.04

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renovate-bot requested review from a team as code owners August 9, 2026 22:42
@trusted-contributions-gcf trusted-contributions-gcf Bot added kokoro:force-run Add this label to force Kokoro to re-run the tests. owlbot:run Add this label to trigger the Owlbot post processor. labels Aug 9, 2026
@product-auto-label product-auto-label Bot added the samples Issues that are directly related to samples. label Aug 9, 2026
@kokoro-team kokoro-team removed the kokoro:force-run Add this label to force Kokoro to re-run the tests. label Aug 9, 2026

@gemini-code-assist gemini-code-assist Bot left a comment

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Code Review

This pull request updates the base Docker image in the Kokoro configuration from Ubuntu 24.04 to Ubuntu 26.04. However, this upgrade is premature and will break the Docker build because several third-party repositories configured in the Dockerfile do not yet support Ubuntu 26.04. It is recommended to revert this change and stick to Ubuntu 24.04.

Comment thread .kokoro/docker/Dockerfile
# We want to use LTS ubuntu from our mirror because dockerhub has a
# rate limit.
FROM mirror.gcr.io/library/ubuntu:24.04
FROM mirror.gcr.io/library/ubuntu:26.04

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high

Upgrading to Ubuntu 26.04 is premature and will break the Docker build. Third-party repositories configured in this Dockerfile (such as Docker CE, Microsoft MSSQL, and Bazel) do not yet have stable releases or package repositories for Ubuntu 26.04. It is recommended to stick to the LTS release (Ubuntu 24.04) until 26.04 is officially released and supported by these external package sources.

FROM mirror.gcr.io/library/ubuntu:24.04

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