I have a similar setup, a ssd as a cache for the root partition. The problem is grub-probe list multiple disks for the boot folder, which caused the /etc/grub.d/10_linux_zfs script.
The 10_linux_zfs is expecting one disk, but the following commands will return several lines. /usr/sbin/grub-probe --target=device /boot -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1848856 Title: Upgrade from 19.04 to 19.10 with zfs on root fails with grub syntax error To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1848856/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
