PSA: What To Do When WordPress updates fail

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When my WordPress installation failed to update recently, it spat out this error:

The authenticity of could not be verified as no signature was found.

This article from BeginWP helped me. See also this WordPress support article.

Possible steps:

1. Delete the .maintenance file. [Hint: It’s a hidden file in ~/wp]

2. Check file permissions.

3. Add your FTP account details to WordPress config file.

4. Update WordPress manually. [This option worked for me.]

If you have other tips, please share them in the comments box.