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When I run sudo apt-get update I get these errors:

E: The repository 'http://old-releases.ubuntu.com/ubuntu focal 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.
E: The repository 'http://old-releases.ubuntu.com/ubuntu focal-updates 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.
E: The repository 'http://old-releases.ubuntu.com/ubuntu focal-backports 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.
E: The repository 'http://old-releases.ubuntu.com/ubuntu focal-security 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.
E: The repository 'http://www.rabbitmq.com/debian testing 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.

Updating from such a repository can't be done securely, and is therefore disabled by default

Mojtaba Arezoomand
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    Ubuntu 20.04 (focal) doesn't reach EOL until 2030, when it'll move from archives to old-releases. Return your system back to default. FYI: Treating Ubuntu as if it's Debian can create problems, so using the QA-tested upgrade features is far safer. You should also clean up your sources to avoid problems (or at least I hope you're using pinning) – guiverc Dec 08 '21 at 11:15
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    Line about http://www.rabbitmq.com/debian should be removed manually. – N0rbert Dec 08 '21 at 12:13

0 Answers0