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Keep in mind, Ubuntu rolls it’s own kernel based on kernel.org release.
Pretty sure optional means optional to use as your FS but not optional on your kernel.
Good to know! I’ll double check my version, then again, I skipped the installer and did things the advanced mode for my install so I might get to skip that issue.
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Out of tree still means not part of kernel.org upstream. You’re imagining a tighter ZFS integration than is actually there in Ubuntu simply because of misunderstanding used terminology.
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