I have determined that the root cause of the ZFS boot issue reported here is in the content generated by update-grub. The initial entry for 'Ubuntu (lowlatency)' is using $menuentry_id_option 'gnulinux-simple- dev/sda4' which fails to load the zfs datasets at the initrd. The menu entry for 'Ubuntu Focal Fossa (development branch)' uses $menuentry_id_option 'gnulinux-rpool/ROOT/ubuntu_xxxxx', also used by the advanced options. These entries boot normally without errors.
The update-grub command is part of the grub2-common package, and should be updated to correct this issue. ** Package changed: zfs-linux (Ubuntu) => grub2 (Ubuntu) ** Changed in: grub2 (Ubuntu) Status: Fix Released => New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1870395 Title: Ubuntu Studio 20.04 ZFS Option Fails to Boot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1870395/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs