[Bug 1893775] [NEW] [UBUNTU 20.04.1] Failure to install Ubuntu 20.04.1 as KVM guest on DASD

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---Problem Description---
Failure to install Ubuntu 20.04.1 as KVM guest on DASD
  
---uname output---
Linux version 5.4.0-42-generic (buildd at bos02-s390x-003) (gcc version 9.3.0 (Ubuntu 9.3.0-10ubuntu2)) #46-Ubuntu SMP Fri Jul 10 00:21:32 UTC 2020 (Ubuntu 5.4.0-42.46-generic 5.4.44)
 
Machine Type = 3096-703 
 
---boot type---
CDROM / ISO image
 
---Install repository type---
Internet repository
 
---Install repository Location---
ports.ubunut.com
 
---Point of failure---
Other failure during installation (stage 1)

I tried to install an Ubuntu 20.04.1 guest from ISO which failed.
Steps to reproduce.
1. Boot from ISO to start installer, in my case I used virt-install, but a manually defined libvirt domain has the same issue:
$ virt-install --name focal.1 --memory 2048 --disk path=/dev/disk/by-path/ccw-0.0.a03f --cdrom ubuntu-20.04.1-live-server-s390x.iso

2. On the installer screen, stay in simple mode and accept all defaults

3. Shortly after a error pop-up appears, saying the installation has failed. Opening the log I see:
...
 storage:
   config:
   - {ptable: gpt, path: /dev/vda, wipe: superblock-recursive, preserve: false, name: '',
     grub_device: false, type: disk, id: disk-vda}
   - {device: disk-vda, size: 22153265152, wipe: superblock, flag: '', number: 1, preserve: false,
     type: partition, id: partition-0}
   - {fstype: ext4, volume: partition-0, preserve: false, type: format, id: format-0}
   - {device: format-0, path: /, type: mount, id: mount-0}
   version: 1
...
An error occured handling 'format-0': OSError - could not get path to dev from kname: vda1
 finish: cmd-install/stage-partitioning/builtin/cmd-block-meta: FAIL: configuring format: format-0
 TIMED BLOCK_META: 1.942
 finish: cmd-install/stage-partitioning/builtin/cmd-block-meta: FAIL: curtin command block-meta


It seems that the new installation procedure isn't correctly detecting virtio-attached DASDs and tries to handle them like SCSI disks (gpt label, ...). This is a regression compared to the debian-installer and prevents the installation of Ubuntu 20.04 KVM guests on DASD.

I cross-checked by running the installation on a QCOW2 image, which
succeeded without problems.

** Affects: subiquity (Ubuntu)
     Importance: Undecided
     Assignee: Skipper Bug Screeners (skipper-screen-team)
         Status: New


** Tags: architecture-s39064 bugnameltc-187975 severity-critical targetmilestone-inin---
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[UBUNTU 20.04.1] Failure to install Ubuntu 20.04.1 as KVM guest on DASD
https://bugs.launchpad.net/bugs/1893775
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