Has http://mirrors.ubuntu.com/mirrors.txt been deprecated? It only appears to show a single source now: http://archive.ubuntu.com/ubuntu/ Is the only source of mirrors now: https://launchpad.net/ubuntu/+archivemirrors
The page I've always used is https://launchpad.net/ubuntu/+archivemirrors or if I want to download an ISO from a mirror https://launchpad.net/ubuntu/+cdmirrors
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