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W: Repositories should provide a clear-signed InRelease file, but none found at http://security.ubuntu.com/ubuntu/dists/impish-security/InRelease.
E: The repository 'http://security.ubuntu.com/ubuntu impish-security Release' does not have a Release file.
W: Updating from such a repository can't be done securely, and is therefore disabled by default.
W: See apt-secure(8) manpage for repository creation and user configuration details.
W: https://hub.unity3d.com/linux/repos/deb/dists/stable/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
mikewhatever
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Tony Groce
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