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Update mirror.gcr.io/library/ubuntu Docker tag to v26 - #14530

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Update mirror.gcr.io/library/ubuntu Docker tag to v26#14530
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renovate-bot:renovate/mirror.gcr.io-library-ubuntu-26.x

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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 21, 2026 07:09
@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 21, 2026
@product-auto-label product-auto-label Bot added the samples Issues that are directly related to samples. label Aug 21, 2026
@kokoro-team kokoro-team removed the kokoro:force-run Add this label to force Kokoro to re-run the tests. label Aug 21, 2026

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

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Code Review

This pull request attempts to upgrade the base Docker image from Ubuntu 24.04 to Ubuntu 26.04. However, feedback indicates that this upgrade breaks the build due to incompatibilities with older Python versions and deprecated features like apt-key in the newer Ubuntu release. It is recommended to revert back to Ubuntu 24.04 to maintain build compatibility.

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 the base image to Ubuntu 26.04 breaks the build. Older Python versions (such as 3.7, 3.8, and 3.9) specified in PYTHON_VERSIONS are incompatible with the newer toolchains, glibc, and OpenSSL 3.x versions present in Ubuntu 26.04, causing compilation failures. Furthermore, deprecated features like apt-key used throughout this Dockerfile are removed or unsupported in newer Ubuntu releases. Retain the stable ubuntu:24.04 base image to maintain build compatibility.

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

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