Direct upgrades from 10.10.7 and 10.11.x to 12.0 are supported; intermediate upgrades are not required. Users running releases older than 10.10.7 are strongly encouraged to upgrade to 10.10.7 before migrating to 12.0.

Installed repository plugins (anything not built-in) should also be removed before migrating. Plugins will likely need time to adapt to the new database changes, so re-adding them afterward is the safest approach for testing.

Official plugins compatible with Jellyfin are available through the stable plugin repository. If you have changed to the unstable plugin repository please change it back.

Go to Dashboard -> Plugins -> Manage Repositories
Update the Plugin Repository URL to: https://repo.jellyfin.org/files/plugin/manifest.json

After migrating please perform the following steps.

Perform a full library scan to restore alternative versions
Run the "Optimize database" scheduled task

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[–] curbstickle@anarchist.nexus 11 points 3 days ago

Skipped to simplify versioning and avoid confusion.

X.Y.Z - changing X only happened with breaking changes to the api. Y would then be big, big updates, but minor in terms of the API (and backwards compatible), and Z for bugfixes and minor updates.

Now the major will be major changes, not just api-breaking ones.