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

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
mirror.gcr.io/library/ubuntu (source)	final	major	24.04 → 26.04

---

Warning

Some dependencies could not be looked up. Check the Dependency Dashboard for more information.

---

Configuration

📅 Schedule: (UTC)

• Branch creation
  • At any time (no schedule defined)
• Automerge
  • At any time (no schedule defined)

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Never, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[gemini-code-assist]

Code Review

This pull request updates the base Docker image in .kokoro/docker/Dockerfile from Ubuntu 24.04 to Ubuntu 26.04. However, this upgrade is premature as Ubuntu 26.04 is not yet a stable LTS release, and it is highly likely to break the build due to compatibility issues with older Python versions and external packages like the Microsoft ODBC driver. It is recommended to revert this change and stick to Ubuntu 24.04.

[gemini-code-assist]

Upgrading the base image to ubuntu:26.04 is premature and will break the build. Ubuntu 26.04 is not yet a stable LTS release. Furthermore, compiling older Python versions (such as Python 3.7 and 3.8) and installing external packages like the Microsoft ODBC driver (which currently uses the Ubuntu 20.04 repository on line 103) are highly likely to fail due to toolchain, glibc, and OpenSSL version mismatches on a newer Ubuntu base. Please revert this change and stick to the stable ubuntu:24.04 LTS.

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