docs: remove conflicting Buildx packages before install

[dvdksn]

Summary

Keep Docker’s official docker-buildx-plugin package name and add the distribution-provided docker-buildx package to the conflicting-package removal steps for Debian and Ubuntu. Both packages install the same CLI plugin binary, which causes Docker Engine installation to fail when docker-buildx is already installed.

Alternative to #25506.

@netlify /engine/install/debian/

• Debian preview
• Ubuntu preview

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[docker-agent]

Assessment: 🟢 APPROVE

The change correctly adds docker-buildx to the conflicting-packages removal steps in both debian.md and ubuntu.md. The package name is accurate, the apt-get remove commands remain syntactically valid, and the addition is symmetric across both files. No style violations, markdown issues, or content accuracy problems detected.

[docker-agent]

Assessment: 🟢 APPROVE

This is a small, focused, and accurate change. The PR correctly adds docker-buildx (the distribution-provided unofficial package) to the list of conflicting packages to remove before installing Docker Engine, for both the Debian and Ubuntu install guides.

The section heading "The unofficial packages to uninstall are:" clearly scopes the list, so the absence of docker-buildx-plugin (Docker's official package, which is installed from Docker's own repository) is correct and intentional.

No style violations, AI-isms, markdown formatting issues, missing redirects, or content accuracy problems were found in the changes introduced by this PR.

[docker-agent]

Assessment: 🟢 APPROVE

The change is minimal, accurate, and well-scoped. Adding docker-buildx to the conflicting-packages removal step in both the Debian and Ubuntu install guides correctly addresses the installation conflict between the distribution-provided docker-buildx package and Docker's official docker-buildx-plugin. The command syntax is valid, the package name is correct, and the change is applied symmetrically across both files. No style violations, missing redirects, or markdown issues were introduced.