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Update mirror.gcr.io/library/ubuntu Docker tag to v26 #14474

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Update mirror.gcr.io/library/ubuntu Docker tag to v26 #14474

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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 Aug 3, 2026

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high

Upgrading the base image to Ubuntu 26.04 is premature and will break the Dockerfile build.

Specifically, the Docker repository setup on lines 76-79 uses $(lsb_release -cs) to fetch the Ubuntu codename:

RUN add-apt-repository \
  "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) \
  stable"

Since Ubuntu 26.04 is not yet fully released or supported by third-party package repositories like Docker, the repository URL for this codename will return a 404 error during apt-get update on line 81.

Please keep the base image at ubuntu:24.04 until 26.04 is officially released and supported by all external dependencies configured in this Dockerfile.

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


ENV DEBIAN_FRONTEND noninteractive

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