Ran into this error while upgrading Grafana T263747 :
root@apt1001:~# reprepro --noskipold checkupdate aptmethod error receiving 'https://artifacts.elastic.co/packages/5.x/apt/dists/stable/Release': '404 Not Found [IP: 2600:1901:0:1d7:: 443]' aptmethod error receiving 'https://artifacts.elastic.co/packages/5.x/apt/dists/stable/Release': '404 Not Found [IP: 2600:1901:0:1d7:: 443]' aptmethod error receiving 'https://packages.elastic.co/curator/5/debian9/dists/stable/Release': 'Redirection loop encountered [IP: 2600:1901:0:1d7:: 80]' aptmethod error receiving 'https://packages.elastic.co/curator/5/debian9/dists/stable/Release.gpg': 'Redirection loop encountered [IP: 2600:1901:0:1d7:: 80]' aptmethod error receiving 'https://archive.cloudera.com/p/cdh5/debian/jessie/amd64/cdh/dists/jessie-cdh5.16.1/InRelease': 'Redirection loop encountered [IP: 199.232.64.167 80]' aptmethod error receiving 'https://archive.cloudera.com/p/cdh5/debian/jessie/amd64/cdh/dists/jessie-cdh5.16.1/Release': 'Redirection loop encountered [IP: 199.232.64.167 80]' aptmethod error receiving 'https://archive.cloudera.com/p/cdh5/debian/jessie/amd64/cdh/dists/jessie-cdh5.16.1/Release.gpg': 'Redirection loop encountered [IP: 199.232.64.167 80]' There have been errors! root@apt1001:~#