Grub update fails on zfs root drives after software install..

[Jeff Hoffman]

My grub.cfg file first menu entry works. Used to refer to specific hard drives which will not work with ZFS root devices.

It also loops and adds another "}" at line 183.

Memtest again refers to /dev/sd<x> which I don't think will work with ZFS filesystems?

See the two files attached.

grub.cfg I modified to make it work to see first menu entry or linux*88 menu entry.

The second one is the generated grub.cfg.new which is bad.

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: ubuntu-release-upgrader-core 1:19.10.15.4
ProcVersionSignature: Ubuntu 5.3.0-45.37-generic 5.3.18
Uname: Linux 5.3.0-45-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu8.8
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Sat Apr 4 10:39:58 2020
InstallationDate: Installed on 2017-05-20 (1049 days ago)
InstallationMedia: Ubuntu-GNOME 17.04 "Zesty Zapus" - Release amd64 (20170412)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: Upgraded to eoan on 2020-03-30 (4 days ago)
VarLogDistupgradeTermlog:

[Jean-Baptiste Lallement (jibel)]

grub.new untar-ed from attachments.

[Jean-Baptiste Lallement (jibel)]

Could you provide the output of the following commands:
lsblk -f
zfs list
zfs list -t snapshot

Thanks

[Jeff Hoffman (jcmj)]

See attached file

[Jean-Baptiste Lallement (jibel)]

Thanks for the logs.

The curly brace error should be fixed now. Now we must understand why it doesn't find the kernels.

- Could you please save /etc/grub.d/10_linux_zfs somewhere outside of /etc/grub.d/
- Replace /etc/grub.d/10_linux_zfs by the file in attachment. It adds set -x to watch its execution and the content of intermediary files to generate the menu.
- Make it executable:
   chmod +x /etc/grub.d/10_linux_zfs
- Then run update-grub:
   sudo update-grub 2>/tmp/update-grub.log

Verify that the log contains something and attach it to this report.

[Jeff Hoffman (jcmj)]

Output after update