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I'm not experienced enough with operation systems and I have a common issue that I looked for a solution but no one is valid.

when I run sudo apt update, I get the following error:

See apt-secure(8) manpage for repository creation and user configuration details.

When I tried to install certbot (http://ppa.launchpad.net/certbot/certbot/ubuntu) in my Ubuntu 20.04, I added a repository so I can download it, but later the OS tell me that "Updating from such a repository can't be done securely, and is therefore disabled by default"

I don't remember how I added it, but it's clearly the solution is remove it from that "package lists". I spent hours looking for a solution but none is valid, why is no one did a clear explanation on how to add/remove a repository from "package lists" ?

can anyone write a valid answer so anyone have this issue will directly find a valid solution for different repositories ?

B. Okba
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    Disco (Ubuntu 19.04) was the last time that repo was supported: http://ppa.launchpad.net/certbot/certbot/ubuntu/dists/ – Terrance Oct 09 '22 at 18:32
  • Since this question is closed, the answer was explained in depth here: https://askubuntu.com/a/92897/1639701. – B. Okba Oct 09 '22 at 21:48

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