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Update error; 400 bad request, the repository is not signed

tf flag

Upon trying to update, I get the following error :

E: Failed to fetch http://mirror.deace.id/ubuntu/dists/jammy/InRelease 400 Bad Request [IP: 185.53.177.54 80] E: The repository 'http://mirror.deace.id/ubuntu jammy InRelease' is not signed. 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.

What should I do (if anything) to resolve this error? I tried to do the following, but the error persists.

apt-get clean
rm -rf /var/lib/apt/lists/*
apt-get clean
apt-get update 
I sit in a Tesla and translated this thread with Ai:

mangohost

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