Problem updating Grafana in a Debian 9

Updating a Debian 9 I get this error with the “grafana” update: $ apt update … Ign:7 https://packagecloud.io/grafana/stable/debian stretch InRelease Err:9 https://packagecloud.io/grafana/stable/debian stretch Release 404 Not Found Reading package lists… Done E: The repository ‘https://packagecloud.io/grafana/stable/debian stretch Release’ does no longer have a Release file. N: Updating from such a repository can’t be done securely, and… Continue reading Problem updating Grafana in a Debian 9

Failed to fetch http://ftp.debian.org/debian/dists/jessie-updates/main/ 404 Not Found

Executing apt update in a Debian 8 I get the error W: Failed to fetch http://ftp.debian.org/debian/dists/wheezy-backports/main/binary-amd64/Packages 404 Not Found [IP: 2001:67c:2564:a119::148:12 80] W: Failed to fetch http://ftp.debian.org/debian/dists/jessie-updates/main/source/Sources 404 Not Found [IP: 2001:41d0:202:100:213:32:5:7 80] W: Failed to fetch http://ftp.debian.org/debian/dists/jessie-updates/main/binary-amd64/Packages 404 Not Found [IP: 2001:41d0:202:100:213:32:5:7 80] W: Failed to fetch http://ftp.debian.org/debian/dists/jessie-backports/main/source/Sources 404 Not Found [IP: 2001:41d0:202:100:213:32:5:7 80]… Continue reading Failed to fetch http://ftp.debian.org/debian/dists/jessie-updates/main/ 404 Not Found