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

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---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.

** Affects: subiquity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: architecture-s39064 bugnameltc-202774 severity-medium targetmilestone-inin---
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[UBUNTU 20.04] Unsupported setup: Directory '/boot' is located on a multi-target device-mapper device
https://bugs.launchpad.net/bugs/2024901
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