Upgrading of 20191010 installed on ZFS will lead to "device-mapper: reload ioctl on osprober-linux-sda6 failed: Device or resource busy" and then to auto-removal of all zfs packages

[Norbert]

Steps to reproduce:
1. Install Ubuntu 19.10 from 20191010 ISO
2. Run `sudo apt-get update` and `sudo apt-get upgrade`
3. Note the following lines in the APT output:

...
Warning: Couldn't find any valid initrd for dataset rpool/ROOT/ubuntu_69xc2t.
Found memtest86+ image: /BOOT/ubuntu_69xc2t@/memtest86+.elf
Found memtest86+ image: /BOOT/ubuntu_69xc2t@/memtest86+.bin
device-mapper: reload ioctl on osprober-linux-sda6 failed: Device or resource busy
Command failed.
done
...
device-mapper: reload ioctl on osprober-linux-sda6 failed: Device or resource busy
Command failed.
done

4. Run `sudo apt-get autoremove --purge`

$ sudo apt-get autoremove --purge
[sudo] password for zfs:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED:
  libnvpair1linux* libuutil1linux* libzfs2linux* libzpool2linux* zfs-initramfs* zfs-zed* zfsutils-linux*
0 upgraded, 0 newly installed, 7 to remove and 0 not upgraded.
After this operation, 5 243 kB disk space will be freed.
Do you want to continue? [Y/n] n
Abort.

Expected results:
* upgrading of packages run without errors

Actual results:
* system will not boot if user will proceed with package autoremoval

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: libzfs2linux 0.8.1-1ubuntu14
ProcVersionSignature: Ubuntu 5.3.0-13.14-generic 5.3.0
Uname: Linux 5.3.0-13-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu8
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sun Oct 13 22:51:39 2019
InstallationDate: Installed on 2019-10-13 (0 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Beta amd64 (20191010)
SourcePackage: zfs-linux
UpgradeStatus: No upgrade log present (probably fresh install)

[Richard Laager (rlaager)]

The osprober part is a duplicate of #1847632.

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1847927

[Adam Conrad (adconrad)]

The autoremoval part should be fixed if you install from a more recent image.

[Jean-Baptiste Lallement (jibel)]

The message about device-mapper comes from os-prober.

[Brian Murray (brian-murray)]

Could you please retest this with an RC iso?

[Jan Wester (j-vester)]

I installed the 20191011 iso in a virtualbox. I used the zfs option. At installation. After installation system comes up fine. But as others here say it displays:

janw@janw-VirtualBox:~$ sudo apt update
Bra:1 http://se.archive.ubuntu.com/ubuntu eoan InRelease
Bra:2 http://se.archive.ubuntu.com/ubuntu eoan-updates InRelease
Bra:3 http://se.archive.ubuntu.com/ubuntu eoan-backports InRelease
Bra:4 http://se.archive.ubuntu.com/ubuntu eoan-proposed InRelease
Bra:5 http://security.ubuntu.com/ubuntu eoan-security InRelease
Läser paketlistor… Färdig
Bygger beroendeträd
Läser tillståndsinformation… Färdig
Alla paket är uppdaterade.
janw@janw-VirtualBox:~$ sudo apt upgrade
Läser paketlistor… Färdig
Bygger beroendeträd
Läser tillståndsinformation… Färdig
Beräknar uppgradering… Färdig
Följande paket har installerats automatiskt och är inte längre nödvändiga:
  libnvpair1linux libuutil1linux libzfs2linux libzpool2linux zfs-initramfs
  zfs-zed zfsutils-linux
Använd ”sudo apt autoremove” för att ta bort dem.
0 att uppgradera, 0 att nyinstallera, 0 att ta bort och 0 att inte uppgradera.

apt update says all packages are installed. But nevertheless apt upgrade want me to run a destructive apt autoremove which will remove all zfs packages and after that break the booting of the system completely.

I also tested the image from 20191012. That image does not boot after installation in the virtualbox.It gives a prompt initramfs> saying that it has problems finding the root partition. I also recognized during installation time that the image from 20191011 did some grub and kernel stuff at the end of installation which i could not see that the image from 20191012 did. Also a popup came during the installation talking about ext4 file systems, which is weird since I chose the zfs installation.

[Adam Conrad (adconrad)]

20191012 is the only one where this is expected to work, however for other hilarious reasons, you need to boot in the live session, upgrade to ubiquity from eoan-proposed (19.10.20), then run the installer.

This should all be in better shape with tonight's images when we spin them (expected serial of 20191014)

[Norbert (nrbrtx)]

The Ubuntu 20191014 is not affected.

[Jan Wester (j-vester)]

Yes, just tested 20191014 and it seems okay. The reported things in this bug seems to be solved.
Only thing remaining now:

sudo update-grub
Sourcing file `/etc/default/grub'
Sourcing file `/etc/default/grub.d/init-select.cfg'
Generating grub configuration file ...
Found linux image: vmlinuz-5.3.0-18-generic in rpool/ROOT/ubuntu_ylgjtz
Found initrd image: initrd.img-5.3.0-18-generic in rpool/ROOT/ubuntu_ylgjtz
Found memtest86+ image: /BOOT/ubuntu_ylgjtz@/memtest86+.elf
Found memtest86+ image: /BOOT/ubuntu_ylgjtz@/memtest86+.bin
device-mapper: reload ioctl on osprober-linux-sda6 failed: Enhet eller resurs upptagen
Command failed.
done

but guess that is another bug and issue