[Bug 2024901] Re: [UBUNTU 20.04] Unsupported setup: Directory '/boot' is located on a multi-target device-mapper device

[Frank Heimes]

@juliank yes, the msg (well, more an error than a warning) is about the
LVM that is w/o separate /boot.

And that made me remembering LP#1680101, pretty old, but I think we carried over the thoughts from back then to the subiquity installer as well, that does create a separate /boot by default, in case LVM is used.
Looks like this (LVM with separate /boot) is the way we want and expect it (to be on the save side).

I think such an installation is not done by the installer by default.

@ppohl May I ask if you've done a manual installation (with root and boot in LVM).
And was you system already upgraded from an older release (maybe from 18.04 or even 16.04)?

My suspicion here is now that such a setup is just not a supported one
(even if it might have once worked).

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Title:
  [UBUNTU 20.04] Unsupported setup: Directory '/boot' is located on a
  multi-target device-mapper device

Status in Ubuntu on IBM z Systems:
  New
Status in s390-tools package in Ubuntu:
  Incomplete

Bug description:
  ---Problem Description---
  System Update did not work on Ubuntu 20.04.6 LTS. After apt update and apt full-upgrade came the following error message:
  ...
  Calling hook copymods
  /usr/share/initramfs-tools/scripts/panic/ORDER ignored: not executable
  /usr/share/initramfs-tools/scripts/local-block/ORDER ignored: not executable
  /usr/share/initramfs-tools/scripts/init-top/ORDER ignored: not executable
  /usr/share/initramfs-tools/scripts/local-bottom/ORDER ignored: not executable
  /usr/share/initramfs-tools/scripts/init-premount/ORDER ignored: not executable
  /usr/share/initramfs-tools/scripts/local-top/ORDER ignored: not executable
  /usr/share/initramfs-tools/scripts/init-bottom/ORDER ignored: not executable
  /usr/share/initramfs-tools/scripts/local-premount/ORDER ignored: not executable
  Building cpio /boot/initrd.img-5.4.0-150-generic.new initramfs
  Using config file '/etc/zipl.conf'
  Run /lib/s390-tools/zipl_helper.device-mapper /boot
  Error: Unsupported setup: Directory '/boot' is located on a multi-target device-mapper device
  Error: Script could not determine target parameters
  run-parts: /etc/initramfs/post-update.d//zz-zipl exited with return code 1

  But the error message is not true. Update used to work before. It is a
  KVM guest. The disk is a qcow2 file not multipath. There is no
  separate /boot partition. It is an ext4 file system.

  Filesystems:
  root at lnxproxy:/# df -h
  Filesystem                     Size  Used Avail Use% Mounted on
  /dev/mapper/vg_bistro-lv_root   12G  8.4G  2.2G  80% /
  /dev/mapper/vg_bistro-lv_home   28G   12G   15G  46% /home
  udev                           888M     0  888M   0% /dev
  tmpfs                          900M   12K  900M   1% /dev/shm
  tmpfs                          900M     0  900M   0% /sys/fs/cgroup

  
  Contact Information = ppohl at de.ibm.com 
   
  ---uname output---
  Linux lnxproxy 5.4.0-150-generic #167-Ubuntu SMP Mon May 15 17:35:14 UTC 2023 s390x s390x s390x GNU/Linux
   
  Machine Type = zKVM guest 
   
  ---System Hang---
   The system was not booting any more. I attached the disk to an other system.
   
  ---Debugger---
  A debugger is not configured
   
  ---Steps to Reproduce---
   Run the command update-initramfs -uv.
   
  *Additional Instructions for ppohl at de.ibm.com: 
  -Post a private note with access information to the machine that the bug is occuring on.

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