So you picked the right image and installer '20.04.1' (live installer), since 
you got interactively promped at the console for the basic network 
configuration information, indicated by:
"Attempt interactive netboot from a URL?" (and the following questions), great!
(The 20.04 image does not have this, but is superseeded by the 20.04.1 image 
anyway ...)

Looks like some more information/clarification about the DNS configuration 
option at this early stage of the installation is needed.
At this stage of the installaton it's about making sure that the installer is 
able to find and reach the image file (ISO).
Hence, either an external DNS is needed, in case you point to the external 
location of the installation image at http://cdimage.ubuntu.com (it's the 
default), or an internal DNS is needed in case the installation is based on a 
local install server (or maybe even none). Internal install servers are pretty 
often used in IBM Z and LinuxONE customer environments and would of course also 
require that an URL, other than the default is specified, that points to your 
local install server.

So far pristine DASDs (DASDs that were never used before and are therefor not 
yet low-level formatted) need to be manually formatted in the (live installer) 
shell - for now - like I suggested in comment #21 and like you now successfully 
did.
This is a known bug that is currently look at and is btw. addressed in this 
separate LP ticket:
LP 1887669 - "subiquity on s390x doesn't handle pristine DASD disks that need 
an initial low-level format" (https://bugs.launchpad.net/bugs/1887669)
(Btw. you are welcome to click the link - roughly at the upper/left at LP 
1887669 - that this bug affects you too.)

I'm happy to see that the installation now worked for you (with this
little workaround of manually calling dasdfmt at the shell) - since it
tells me that the somewhat special 3390-ModA EAV and EAV-II DASDs (like
your 3390 MOD60 - configured as a multiple of 60 of a 3390 MOD1)
generally work!

Just reiterating on Steve's comment:
- The the legacy d-i 20.04 image (mentioned earlier) is still available, but 
will not be updated anymore
- If you think that it should be possible to specify more (network, but also 
other) configuration information or if more clarity is needed, please let us 
know.

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https://bugs.launchpad.net/bugs/1878596

Title:
  [Ubuntu 20.04] - Install - problem

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