Focal InRelease Error" is not signed. How to fix?

Question

ubuntu

Today, by itself, it stopped updating and installing packages. Apparently there is some problem with the keys, but I did not climb there.

Ошб:1 http://mirrors.online.net/ubuntu focal InRelease
  Неизвестная ошибка при выполнении apt-key

W: Ошибка GPG: http://mirrors.online.net/ubuntu focal InRelease: Неизвестная ошибка при выполнении apt-key
E: Репозиторий «http://mirrors.online.net/ubuntu focal InRelease» не подписан.

And so on throughout the list of repositories. The same provider has another server, there is exactly the same 20.04.2 LTS with the same repositories and everything works.

How to understand what happened and how to fix it?

Answer 1

Helped:
* apt-get --allow-insecure-repositories update
* apt-get install --reinstall gpgv libgcrypt20

Answer 2

well, remove them
, maybe these turnips are already rotten))