root@debian:~# apt-get update
Get:1 http://security.debian.org/debian-security bullseye-security InRelease [48.4 kB]
Hit:2 http://deb.debian.org/debian bullseye InRelease
Hit:3 http://deb.debian.org/debian bullseye-updates InRelease
Hit:4 https://download.docker.com/linux/debian bullseye InRelease
Ign:5 https://dl.bintray.com/nrel/api-umbrella-debian stretch InRelease
Err:6 https://dl.bintray.com/nrel/api-umbrella-debian stretch Release
404 Not Found [IP: 52.73.121.136 443]