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Update mirror.gcr.io/library/ubuntu Docker tag to v26 #14413

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Update mirror.gcr.io/library/ubuntu Docker tag to v26 #14413

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2 changes: 1 addition & 1 deletion .kokoro/docker/Dockerfile
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Expand Up @@ -14,7 +14,7 @@

# 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

@gemini-code-assist gemini-code-assist Bot Jul 14, 2026

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high

Upgrading to ubuntu:26.04 will break the Docker build. Ubuntu 26.04 LTS is not yet released, meaning the image may not exist or is highly unstable. Furthermore, external repositories configured later in this Dockerfile (such as the Docker CE repository on lines 76-79) use $(lsb_release -cs) to determine the distribution codename. Since Docker does not yet publish packages for Ubuntu 26.04, apt-get update will fail with a 404 error. Please revert this change and stick to the stable ubuntu:24.04 LTS release.

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


ENV DEBIAN_FRONTEND noninteractive

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