apt 报错 An error occurred during the signature verification

报错信息:

W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://xxxxxxxxxxxxx/ubuntu focal InRelease: Couldn’t create temporary file /tmp/apt.conf.xxxxxxxx for passing config to apt-key

参考解决方案之一:

chmod 777 /tmp

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