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Ubuntu 20.10 has an option in installer to use ZFS encryption for root partition.

Oh sweet, I don't think encryption was an option in 20.04. Is it still under an "experimental" option in the installer?

Yeah, still experimental but improved over 20.04. Added encryption and "autotrim=on" by default.

I think Canonical planing is to have ZFS as an experimental option only for Desktop version of Ubuntu until next LTS release.