I updated both Ubuntu and I upgrade FreeBSD to 12.1, but it did not
help. Both system remain incompatible.

So what should we learn:
- Never break the send/receive compatibility, especially not if you demand 
during the install the complete disk (Ubuntu) or all complete disks (Raid-0 or 
1) (FreeBSD). 
The minimum improvement I expect for the 20.04 installation, is one size 
parameter! So that I can limit the part of the disk used by Ubuntu itself (ext4 
partition + swap partition + bpool + rpool). For Ubuntu it is like installing 
on a smaller disk. At least the remainder of the disk could be used to create 
own datapools with the correct feature settings.
- ZFS should give useful not conflicting error messages as explained in my 
first entry. 

In the mean time I have to; 
- backup my dpool (normal files) on my HDDs an recreate dpool with the correct 
feature set;
- restore those normal files to dpool and run the send/receive backup to 
FreeBSD;
- copy my VMs temporarily to that new dpool and delete those datasets on rpool.
- snapshot all Ubuntu datasets and send/receive those to an USB drive.
- boot from ext4, I'm lucky I have a dual boot with ext4 and zfs.
- delete rpool, create a new 20GB rpool version and reverse send/receive Ubuntu 
from USB to rpool
- check UUIDs in /boot/grub/grub.cfg, fstab and resume; reboot and pray
- recreate a vpool for the virtual machines with the right feature set and 
restore those.
- run the backup to FreeBSD.

My laptop has already large-dnode active as result of an incremental
backup, so I have to recreate that datapool too with the right feature
set.

As last resort I take my last free SATA HDD (80GB) from my 2nd desktop
and install Ubuntu on it and use the 512GB NVME SSD for my virtual
machines. That Ubuntu Host OS is a minimal install and I only use
Firefox, nautilus, the terminal and gedit from it. In practice the Host
OS will run completely from L1ARC, surely if I use Firefox from the VMs
like I do often.

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https://bugs.launchpad.net/bugs/1854982

Title:
  Lost compatibilty for backup between Ubuntu 19.10 and FreeBSD 12.0

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