I haven't tried to do it with Ubuntu specifically, but I do know that ZFS-on-linux works fine atop LUKS full-disk encryption. My laptop is running NixOS with s

I haven't tried to do it with Ubuntu specifically, but I do know that ZFS-on-linux works fine atop LUKS full-disk encryption. My laptop is running NixOS with such a setup, and I'm pretty sure I followed the Ubuntu ZFS documentation while figuring out how to do it. (summary: I don't know how to make it super easy, but what you want should totally work)