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=== Nginx - apt update - The following signatures were invalid - EXPKEYSIG ABF5BD827BD9BF62 nginx signing key ===


Ошибка при обновлении пакетов Ubuntu:
 Err:2 http://nginx.org/packages/ubuntu focal InRelease
  The following signatures were invalid: EXPKEYSIG ABF5BD827BD9BF62 nginx signing key <signing-key@nginx.com>
 W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error:  http://nginx.org/packages/ubuntu focal InRelease: The following signatures were invalid: EXPKEYSIG ABF5BD827BD9BF62 nginx signing key <signing-key@nginx.com>
 W: Failed to fetch http://nginx.org/packages/ubuntu/dists/focal/InRelease  The following signatures were invalid: EXPKEYSIG ABF5BD827BD9BF62  nginx signing key <signing-key@nginx.com>
 W: Some index files failed to download. They have been ignored, or old ones used instead.


Причем метод по обновлению PGP ключа по официальной ссылке не помог:
 https://blog.nginx.org/blog/updating-pgp-key-for-nginx-software
 
 # curl https://nginx.org/keys/nginx_signing.key | gpg --dearmor | sudo tee /usr/share/keyrings/nginx-archive-keyring.gpg >/dev/null


Решение:
 # apt-key adv --refresh-keys --keyserver keyserver.ubuntu.com
 # apt update