Update ubuntu.md

[adamoutler]

Description

Add recommended extras pass and golang-docker-credential-helpers to prevent insecure docker login password storage on Ubuntu.

• [ ] Technical review
• [ ] Editorial review
• [ ] Product review

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[docker-robot[bot]]

Thanks for the pull request. We'd like to make our product docs better, but haven’t been able to review all the suggestions. As our docs have also diverged, we do not have the bandwidth to review and rebase old pull requests.

If the updates are still relevant, review our contribution guidelines and rebase your pull request against the latest version of the docs, then mark it as fresh with a /remove-lifecycle stale comment. If not, this pull request will be closed in 30 days. This helps our maintainers focus on the active pull requests.

Prevent pull requests from auto-closing with a /lifecycle frozen comment.

/lifecycle stale