in the function _set_url_paths it makes up the defaults:

  # generic
  url_prefix = "current/images"
  ...
  # s390x specific as it can't find "normal" kernel/initrd there
  hvmroot = "%s/generic/" % url_prefix
  kernel_basename = "kernel.%s" % self._debname

That will construct
http://ports.ubuntu.com/ubuntu-ports/dists/bionic/main/installer-s390x/current/images/generic/kernel.ubuntu

Which was the correct old path.
The new path would be the new path.

http://ports.ubuntu.com/ubuntu-ports/dists/focal/main/installer-
s390x/current/legacy-images/generic/kernel.ubuntu

But that differs based on the version, if you want to install a bionic guest 
the old code works.
@Andrew - you might want to ask to keep the old layout instead of changing this 
(and probably many other tools/scripts)?

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https://bugs.launchpad.net/bugs/1872941

Title:
  [Ubuntu 20.04] virt-install fails to detect path after images folder
  name has changed

Status in Ubuntu on IBM z Systems:
  Triaged
Status in linux package in Ubuntu:
  Invalid
Status in virt-manager package in Ubuntu:
  New

Bug description:
  Installer version: Latest
  https://ports.ubuntu.com/ubuntu-ports/dists/focal/main/installer-s390x

  Description/Reproduction:
  Start virt-install with the following options:

  virt-install \
  --name ubuntu20-guest1 \
  --memory 4096 \
  --vcpus 4 \
  --disk "size=4" \
  --location 
http://ports.ubuntu.com/ubuntu-ports/dists/focal/main/installer-s390x \
  --network "network=default" 

  Error:
  ERROR    Error validating install location: Could not find an installable 
distribution at 
'http://ports.ubuntu.com/ubuntu-ports/dists/focal/main/installer-s390x'

  The location must be the root directory of an install tree.
  See virt-install man page for various distro examples.

  
  Looking at previous releases I would guess it expects an "images" directory 
instead of the new "classic-images" directory. I'm aware of the workaround to 
specify kernel/initramfs directly but that shouldn't be a solution.

  == Comment: #2 - Andre Wild1 <andre.wi...@ibm.com> - 2020-04-15 03:51:21 ==
  (In reply to comment #0)
  > Installer version: Latest
  > https://ports.ubuntu.com/ubuntu-ports/dists/focal/main/installer-s390x
  > 

  Sorry I've copied the wrong link. This is the link I've used successfully in 
the past:
  http://ports.ubuntu.com/ubuntu-ports/dists/focal/main/installer-s390x

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