Since there are some discussions about this ticket on other
communication channels, I want to clarify and sum up the situation here:

An installation on a DASD disk that is virtio-attached, like:
virt-install --name focal --memory 2048 --disk 
path=/dev/disk/by-path/ccw-0.0.1234 --cdrom ./install_image.iso
works with d-i since, there is a 'non-standard way' (or one may call it 'hack') 
to identify that a certain disk that is passed over via virtio is not (as 
usual) a SCSI disk, but a DASD (based on the partition table).
We think that the clean way is to pass/attach DASD disks as ccw devices (what 
they actually are),
but we will look into this, since it worked with d-i.
Since this is a non-straight forward way to identify disk geometry, something 
like this would require 'extra coding' (or again some hacking).

However, nobody should be blocked by this, since there is still the focal / 
20.04 legacy d-i image available, that allows such virt-install installation, 
like (in short):
virt-install --name focal --memory 2048 --disk 
path=/dev/disk/by-path/ccw-0.0.261e --cdrom 
./ubuntu-20.04-legacy-server-s390x.iso
(for details see the attachment)

Even if the legacy d-i image is based on 20.04 GA, an installation (with
access to the archives) will end up as a proper 20.04.1 installation (as
of today), since the installer updates by default to the latest package
levels.

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https://bugs.launchpad.net/bugs/1893775

Title:
  [UBUNTU 20.04.1] Failure to install Ubuntu 20.04.1 as KVM guest on
  DASD

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