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chore(deps): update mirror.gcr.io/library/ubuntu docker tag to v26#14257

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chore(deps): update mirror.gcr.io/library/ubuntu docker tag to v26#14257
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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 final major 24.0426.04

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@renovate-bot renovate-bot requested review from a team as code owners June 1, 2026 05:45
@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 Jun 1, 2026
@product-auto-label product-auto-label Bot added the samples Issues that are directly related to samples. label Jun 1, 2026
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Code Review

This pull request attempts to upgrade the base Ubuntu image in the Dockerfile from version 24.04 to 26.04. However, Ubuntu 26.04 LTS is not yet released, which will cause the Docker build to fail. It is recommended to revert this change and stick to the current LTS version (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

Ubuntu 26.04 LTS is not yet released (scheduled for April 2026). Upgrading to this base image version prematurely will cause the Docker build to fail because the image tag does not exist or is an unstable pre-release. It is recommended to stick to the current LTS version (24.04) until 26.04 is officially released.

@kokoro-team kokoro-team removed the kokoro:force-run Add this label to force Kokoro to re-run the tests. label Jun 1, 2026
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