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I would suggest that this paragraph needs to be rephrased. The concept of a default authentication mechanism is confusing. For beginners who use this document (it is the among the top results on Google for āubuntu postgresqlā) to setup their instance for the very first time, the paragraph gives the impression that it is postgresql that has a default authentication method. As you may know, it is not the case. Default authentication methods are decided by package maintainers and vary depending on the distribution.
In addition, the default configuration in Ubuntu now uses āpeerā authentication as its default for ālocalā connections and āmd5ā for āhostā connections. IDENT is irrelevant.
Thank you for your feedback. Sorry this took so long, but weāve been working through lots of feedback received on these docs. We think weāve now addressed all feedback above this comment by editing the original text above. Are our edits OK, and have we correctly understood and addressed your feedback? If not, please let us know. Otherwise, as the feedback is incorporated, weāll delete the feedback comments to clean up in about a month from now.