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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

slikts
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    17.04 is already EOL, so the upgrade path is gone. ie. It too is in old-releases.ubuntu.com where the upgrade-path doesn't look. release-upgrade is now too late for 16.10, backup & install (a supported version of Ubuntu; and consider sticking to LTS or long-term support releases) – guiverc Jan 25 '18 at 11:54
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    You should just do a fresh install, otherwise you'd be attempting 16.10 > 17.04 > 17.10. Less than 50-50 that works out well plus time consuming. As far as the old-release repos - while the packages list index lists yakkety packages in reality few are actually in the package pool. (if any). For example your bsdutils - goes from 2,26.2 (wily) to 2.29-1 (zesty). Maybe someone forgot to actually add yakkety packaes to the pool, http://old-releases.ubuntu.com/ubuntu/pool/main/u/util-linux/ maybe they're saving 'resources' (money), don't know.... so don't waste your time – doug Jan 25 '18 at 23:35

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