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chore(deps): update mirror.gcr.io/library/ubuntu docker tag to v26#14153

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chore(deps): update mirror.gcr.io/library/ubuntu docker tag to v26#14153
renovate-bot wants to merge 1 commit intoGoogleCloudPlatform:mainfrom
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 May 9, 2026 14:25
@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 May 9, 2026
@product-auto-label product-auto-label Bot added the samples Issues that are directly related to samples. label May 9, 2026
@kokoro-team kokoro-team removed the kokoro:force-run Add this label to force Kokoro to re-run the tests. label May 9, 2026
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Code Review

This pull request updates the base image in the Dockerfile to Ubuntu 26.04. Feedback highlights that Ubuntu 26.04 is not a released version, which will cause the build to fail, and notes that other hardcoded version references in the file were not updated, leading to an inconsistent environment.

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 26.04 is problematic. First, Ubuntu 26.04 is not a released version, so the build will fail when attempting to pull the image. Second, the Dockerfile contains hardcoded references to older versions (e.g., line 103 uses 20.04 and line 238 mentions 24.04) that are not updated, creating an inconsistent environment.

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

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