I want to upgrade from 16.10 to a current release; following the EOL Upgrades wiki instructions I changed my repo URLs to old-releases.ubuntu.com, and apt update now completes successfuly, but upgrade fails with 404 Not Found errors for packages. Does this mean that it's impossible to upgrade 16.10 (Yakkety Yak) without doing a fresh install?
Edit: The instructions in this answer don't work since they result in errors like this:
E: Failed to fetch http://old-releases.ubuntu.com/ubuntu/pool/main/u/util-linux/bsdutils_2.28.2-1ubuntu1.2_amd64.deb 404 Not Found
