ubuntu 19.10 zfs on root, grub2 failure

[Dong Liu]

While doing apt upgrade,

/etc/kernel/postinst.d/initramfs-tools:
update-initramfs: Generating /boot/initrd.img-5.3.0-24-generic
I: The initramfs will attempt to resume from /dev/sda3
I: (UUID=1c7a09f2-895b-4f6d-970e-2ef13f19ea00)
I: Set the RESUME variable to override this.
/etc/kernel/postinst.d/zz-update-grub:
/usr/sbin/grub-probe: error: failed to get canonical path of `rpool/ROOT/ubuntu_w174bf'.
run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 1........]
dpkg: error processing package linux-image-5.3.0-24-generic (--configure):
 installed linux-image-5.3.0-24-generic package post-installation script subprocess returned e
rror exit status 1
Errors were encountered while processing:
 linux-image-5.3.0-24-generic
E: Sub-process /usr/bin/dpkg returned an error code (1)

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: grub2 (not installed)
ProcVersionSignature: Ubuntu 5.3.0-23.25-generic 5.3.7
Uname: Linux 5.3.0-23-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sun Dec 8 11:51:44 2019
InstallationDate: Installed on 2019-11-03 (35 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: grub2
UpgradeStatus: No upgrade log present (probably fresh install)

[Michael Hooker (dain-bramage)]

I had similar problem when upgrading to Ubuntu 19.10 from 19.04 root on zfs.

sudo dpkg --configure -a
Setting up initramfs-tools (0.133ubuntu10) ...
update-initramfs: deferring update (trigger activated)
Setting up linux-image-5.3.0-24-generic (5.3.0-24.26) ...
Setting up friendly-recovery (0.2.41) ...
Sourcing file `/etc/default/grub'
Sourcing file `/etc/default/grub.d/init-select.cfg'
Generating grub configuration file ...
Found linux image: vmlinuz-5.0.0-25-generic in rpool/ROOT/ubuntu
Found initrd image: initrd.img-5.0.0-25-generic in rpool/ROOT/ubuntu
Found linux image: vmlinuz-5.0.0-36-generic in rpool/ROOT/ubuntu
Found initrd image: initrd.img-5.0.0-36-generic in rpool/ROOT/ubuntu
Found linux image: vmlinuz-5.0.0-37-generic in rpool/ROOT/ubuntu
Found initrd image: initrd.img-5.0.0-37-generic in rpool/ROOT/ubuntu
Found linux image: vmlinuz-5.3.0-24-generic in rpool/ROOT/ubuntu
Found initrd image: initrd.img-5.3.0-24-generic in rpool/ROOT/ubuntu
Warning: Failed to find a valid directory 'etc' for dataset 'rpool/ROOT/ubuntu@install'. Ignoring
Warning: Ignoring rpool/ROOT/ubuntu@install
Warning: Failed to find a valid directory 'etc' for dataset 'rpool/ROOT/ubuntu@1904'. Ignoring
Warning: Ignoring rpool/ROOT/ubuntu@1904
Warning: Failed to find a valid directory 'etc' for dataset '<email address hidden>'. Ignoring
Warning: Ignoring <email address hidden>
Warning: Failed to find a valid directory 'etc' for dataset 'rpool/ROOT/ubuntu@21Aug19'. Ignoring
Warning: Ignoring rpool/ROOT/ubuntu@21Aug19
Warning: Failed to find a valid directory 'etc' for dataset 'rpool/ROOT/ubuntu@mysql'. Ignoring
Warning: Ignoring rpool/ROOT/ubuntu@mysql
Warning: Failed to find a valid directory 'etc' for dataset '<email address hidden>'. Ignoring
Warning: Ignoring <email address hidden>
Warning: Failed to find a valid directory 'etc' for dataset '<email address hidden>'. Ignoring
Warning: Ignoring <email address hidden>
Warning: Failed to find a valid directory 'etc' for dataset 'rpool/ROOT/ubuntu@beforeupgrade'. Ignoring
Warning: Ignoring rpool/ROOT/ubuntu@beforeupgrade
device-mapper: reload ioctl on osprober-linux-nvme0n1p3 failed: Device or resource busy
Command failed.
device-mapper: reload ioctl on osprober-linux-nvme1n1p3 failed: Device or resource busy
Command failed.
Adding boot menu entry for EFI firmware configuration
error: syntax error.
error: Incorrect command.
error: syntax error.
Syntax error at line 162
Syntax errors are detected in generated GRUB config file.
Ensure that there are no errors in /etc/default/grub
and /etc/grub.d/* files or please file a bug report with
/boot/grub/grub.cfg.new file attached.
dpkg: error processing package friendly-recovery (--configure):
 installed friendly-recovery package post-installation script subprocess returned error exit status 1
Setting up grub-efi-amd64 (2.04-1ubuntu12.1) ...
Installing for x86_64-efi platform.
Installation finished. No error reported.
Sourcing file `/etc/default/grub'
Sourcing file `/etc/default/grub.d/init-select.cfg'
Generating grub configuration file ...
Found linux image: vmlinuz-5.0.0-25-generic in rpool/ROOT/ubuntu
Found initrd image: initrd.img-...

[Didier Roche-Tolomelli (didrocks)]

for reference, this might be a duplicate of 1848856 as the error message is one of the fix we made.

[Clemens Lang (neverpanic)]

Should have searched before, I think you're hitting 1867910. The problem is explained and a workaround is available over there.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.