Hello,
I have these lines this morning:
[…]
Err:7 https://mirror.mva-n.net/mariadb/repo/10.4/ubuntu focal Release
Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate. Could not handshake: Error in the certificate verification. [IP: 195.65.111.42 443]
[…]
Reading package lists... Done
E: The repository 'https://mirror.mva-n.net/mariadb/repo/10.4/ubuntu focal Release' no longer has 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.
I prefer ask before doing a mistake.
Regards