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Update mirror.gcr.io/library/ubuntu Docker tag to v26 - autoclosed #14401

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Update mirror.gcr.io/library/ubuntu Docker tag to v26 - autoclosed #14401

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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 9, 2026

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Upgrading to Ubuntu 26.04 breaks the Docker build because apt-key has been completely removed in Ubuntu 26.04. Several commands in this Dockerfile still rely on apt-key add (such as lines 74, 102, and 253). Before upgrading the base image to 26.04, these steps must be migrated to use the modern approach of downloading keys to /etc/apt/keyrings/ and referencing them via the signed-by option in the repository sources files.


ENV DEBIAN_FRONTEND noninteractive

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