Typing "sudo apt-get update" I get this error ... Err:7 http://archive.canonical.com juno Release
404 Not Found [IP: 80] ... E: The repository 'http://archive.canonical.com juno Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.

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