I ran into this issue too after setting up dual boot with FreeBSD on my system. An unattended upgrade wiped out my grub menu since it mistook the "etc" dataset in the FreeBSD zfs pool as a signal that it contained an Ubuntu install.
The hack described by Benjamin worked for me, although it definitely doesn't seem like a very sound solution. ``` ubuntu@ubuntu:~$ diff -u /etc/grub.d/10_linux_zfs /mnt/etc/grub.d/10_linux_zfs --- /etc/grub.d/10_linux_zfs 2020-09-08 10:24:35.000000000 +0000 +++ /mnt/etc/grub.d/10_linux_zfs 2020-10-13 00:10:59.644606544 +0000 @@ -383,7 +384,8 @@ # read machine-id/os-release from /etc etc_dir=$(get_system_directory "${dataset}" "etc" "true" "${mntdir}" "") - if [ -z "${etc_dir}" ]; then + # KWA: Temporary hack from https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1850003 + if [ -z "${etc_dir}" ] || [ ! -f "${etc_dir}/os-release" ]; then grub_warn "Ignoring ${dataset}" mountpoint -q "${mntdir}/etc" && umount "${mntdir}/etc" || true umount "${mntdir}" ``` Rather than inspecting the contents of the dataset, it might be better to just set a property on the dataset tagging it as part of an Ubuntu install. I'm not sure at the moment whether it's possible to just set arbitrary custom properties on a dataset. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1850003 Title: /etc/grub.d/10_linux_zfs doesn't skip non-linux zpools To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1850003/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs