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Update mirror.gcr.io/library/ubuntu Docker tag to v26 - autoclosed #14553

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Update mirror.gcr.io/library/ubuntu Docker tag to v26 - autoclosed #14553

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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 31, 2026

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high

Upgrading to Ubuntu 26.04 is premature and will break the Docker build. Ubuntu 26.04 is a future LTS release, and the tag 26.04 may not exist or be stable on the mirror. Furthermore, upgrading to 26.04 will break several downstream installation steps:

  1. Docker CE Installation (Lines 76-79): The script uses $(lsb_release -cs) to fetch the Ubuntu codename. Since Docker does not yet publish stable packages for Ubuntu 26.04, apt-get update will fail with a 404 error.
  2. Microsoft ODBC Driver (Line 103): The repository config is hardcoded to ubuntu/20.04, which will likely cause severe dependency conflicts (e.g., libssl version mismatches) on Ubuntu 26.04.

Please revert this change and stick to the stable LTS version 24.04.

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


ENV DEBIAN_FRONTEND noninteractive

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