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.
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https://bugs.launchpad.net/bugs/1850003
Title:
/etc/grub.d/10_linux_zfs doesn't skip non-linux zpools
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