The problem seems to be that grub-mkconfig doesn't account for grub- probe producing a multiple lines of output with a ZFS root device:
/usr/sbin/grub-probe --target=device / /dev/sdj1 /dev/sdi3 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1582811 Title: update-grub produces broken grub.cfg with ZFS mirror volume To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1582811/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
