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Update mirror.gcr.io/library/ubuntu Docker tag to v26 - autoclosed #14388

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Update mirror.gcr.io/library/ubuntu Docker tag to v26 - autoclosed #14388

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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 7, 2026

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critical

Upgrading the base image to Ubuntu 26.04 will break the Docker build due to several critical compatibility issues:

  1. Removal of apt-key: In Ubuntu 26.04, the legacy apt-key utility has been completely removed. The Dockerfile currently uses apt-key add in multiple places (lines 74, 102, and 253) to add GPG keys for Docker, Microsoft SQL Server, and Google Chrome. These steps will fail with apt-key: command not found.
  2. Compilation of Older Python Versions: Building older Python versions (such as 3.7, 3.8, and 3.9) from source on Ubuntu 26.04 will fail because these older Python versions do not support the newer OpenSSL 3.x/3.5+ libraries and modern GCC versions included in Ubuntu 26.04 without extensive patching.

It is recommended to revert this upgrade and keep the base image at ubuntu:24.04 until the Dockerfile's repository key management is modernized (using /etc/apt/keyrings and signed-by) and the compatibility of building legacy Python versions is addressed.

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


ENV DEBIAN_FRONTEND noninteractive

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