Upgrader: when a manual upgrade is needed, point to the news & manual upgrade doc without specifying a (probably incorrect) version
At some point in the N+1.x life cycle, the Release Manager stops updating UDFs for N.x. So far, the Upgrader incorrectly assumed these UDFs were always up-to-date, and thus would keep advertising manual upgrades to an older, obsolete N+1.x release — which is neither desirable nor possible.
Let's acknowledge that UDFs for older versions will eventually become outdated. And thus, when a manual upgrade is advertized, and no automatic upgrade is, let's just point to the /news and manual upgrade documentation on our website.
Of course, it would be better to:
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Either, keep all old UDFs up-to-date. This would require more work in the release process area.
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Or, retrieve information about the latest release (https://tails.boum.org/inc/stable_amd64_version/) at runtime. This would require more coding work than this commit.
Closes #17069 (closed)