I'm not sure. Maybe it's because they're not really supporting it all that well. The hole_birth data loss bug is still not fixed in 16.04 LTS. https://bugs.l

I'm not sure. Maybe it's because they're not really supporting it all that well. The hole_birth data loss bug is still not fixed in 16.04 LTS. https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1600060 https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/160... This is a major data loss issue with some workflows and it's pretty significant that Canonical hasn't backported it.