Wahoo! Found the magic combination. chrooted into the broken jammy system.
Add a Noble sources list. Add the ppa. Edit the added /etc/apt/sources.list.d/ubuntu-uefi-team-ubuntu-build-jammy.list's active line to: >>> deb [trusted=yes] https://ppa.launchpadcontent.net/ubuntu-uefi-team/build/ubuntu/ noble main >>> Update the apt cache Install grub-efi-amd64 & grub-efi-amd64-signed from the ppa. Reconfigure Grub2 and update the initramfs images. Change the sources list back to the original jammy sources.list There were still existing snapshots there. Exit the chroot. Umount the mounts. Export the pools. Reboot. Booted fine. Fixed. Successful. Booting from Grub2 2.12. Writing up the work-around to fix it. I can post it on my ZFS -Fixes/Work-Arounds GitHub Repo. ...Or I can post it here. Maybe here is best. That way it is a known work-around for broken affected systems, until we can figure out the next step. The next step would be, how do we get Grub2 2.12 into Jammy through the updates channel? I would say it first needs to go to jammy proposed, then tested that it works through an update process. Then respin the installer ISO or include it in the next point release.. Since there is a fix, we don't need to create new victims. Just thinking out loud. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to zfs-linux in Ubuntu. https://bugs.launchpad.net/bugs/2051999 Title: Grub2 2.06 has upstream bug that results in Non-booting with ZFS after snapshot of bpool. Status in grub2 package in Ubuntu: Confirmed Status in grub2-unsigned package in Ubuntu: Confirmed Status in zfs-linux package in Ubuntu: New Bug description: There is an upstream Bug with Grub where if you create snapshots of bpool, it results in a non-booting System. The problem was found to be an upstream Bug with Grub2: https://savannah.gnu.org/bugs/index.php?64297 Multiple Ubuntu 22.04.3 Users Affected: https://ubuntuforums.org/showthread.php?t=2494397&highlight=zfs+grub+bug https://ubuntuforums.org/showthread.php?t=2494957 Brought up as an issue at OpenZFS: https://github.com/openzfs/zfs/issues/13873 If you look at this comment (https://github.com/openzfs/zfs/issues/13873#issuecomment-1892911836), if was found the Savanaugh at GNU released a fix for it in Grub2 2.12, here: https://git.savannah.gnu.org/cgit/grub.git/log/grub-core/fs/zfs/zfs.c Ubuntu Jammy 22.04.3 is Grub2 2.06. We need to backported this patch to Grub2 2.06 so that Users are not caught of in this bug for or currently supported LTS Release. ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: grub-efi-amd64 2.06-2ubuntu14.4 ProcVersionSignature: Ubuntu 6.2.0-39.40~22.04.1-generic 6.2.16 Uname: Linux 6.2.0-39-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset nvidia ApportVersion: 2.20.11-0ubuntu82.5 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: GNOME Date: Thu Feb 1 16:40:28 2024 InstallationDate: Installed on 2021-09-23 (861 days ago) InstallationMedia: Ubuntu 20.04.3 LTS "Focal Fossa" - Release amd64 (20210819) SourcePackage: grub2-unsigned UpgradeStatus: Upgraded to jammy on 2022-08-17 (533 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/2051999/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
