[devwastaken]

It does and did, tested on 20.10. Similar stories: https://reddit.com/r/zfs/comments/hasfax/how_do_you_update_l...

It's supposedly meant to "just work" but out of the box it did not. Which is a very common story with ubuntu sadly.

[kasabali]

That link is about Debian. Debian doesn't ship zfs module and it needs to be compiled separately for each kernel version.

Ubuntu ships ZFS module in kernel package and it works without having to be compiled nor it needs header package.