I believe the invalid grub menu is caused by wrong "}", when there is only a main section.
** Patch added: "1848856.debdiff" https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1848856/+attachment/5298611/+files/1848856.debdiff -- 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