doing a package update in BeagleBone Black I get the following error, which was not appearing a few hours ago.
Hit:3 http://deb.debian.org/debian-security buster/updates InRelease Get:4 http://deb.debian.org/debian buster-backports InRelease [51.4 kB] Err:5 http://repos.rcn-ee.com/debian buster InRelease 403 Forbidden [IP: 220.127.116.11 80] Reading package lists... Done E: Failed to fetch http://repos.rcn-ee.com/debian/dists/buster/InRelease 403 Forbidden [IP: 18.104.22.168 80] E: The repository 'http://repos.rcn-ee.com/debian buster InRelease' is no longer 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.