Solutions
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Nicola Zilio's post in ODROID N2+: Cannot install ZFS was marked as the answerHi @Igor,
Thank you for following up on this!
In the end, coincidentally I think, I managed to get it to work. I saw that a new armbian package was available via apt. I installed it, and because it included kernel 6.6.61-current-meson64, I saw that when this was being built, one of the steps was to write the headers for ZFS. I restarted my board, and now ZFS works.