[Bug 2146873] Re: Custom partitioning on DASD ECKD (s390x) can lead to a failed installation

[Frank Heimes]

A test version of subiquity is available that incl. a fix for this bug.
It can be installed at the first tUI screen of subiquity, by entering the shell and executing:
snap refresh subiquity --channel=latest/edge/test --ignore-running

That allowed me to test the fix successfully, using several different cases:
- 1) /boot, 2) root 3) swap - on z/VM
- 1) swap, 2) root 3) /boot - on z/VM
- 1) /boot, 2) root 3) swap - on LPAR
- 1) swap, 2) root 3) /boot - on LPAR
and regression testing the cases that still worked before (the 'workaround' cases):
- 1) /boot, 2) swap 3) root - on LPAR
- 1) swap, 2) /boot 3) root - on LPAR
And they all worked fine for me, using custom partitioning and ext4 for the filesystems.

I thing we can go ahead with the fix.

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https://bugs.launchpad.net/bugs/2146873

Title:
  Custom partitioning on DASD ECKD (s390x) can lead to a failed
  installation

Status in subiquity:
  In Progress
Status in Release Notes for Ubuntu:
  Fix Released
Status in Ubuntu on IBM z Systems:
  Confirmed
Status in curtin package in Ubuntu:
  New
Status in subiquity package in Ubuntu:
  In Progress

Bug description:
  Using custom partitioning for DASD ECKD disk devices on s390x can lead
  to a failed installation and crash, due to the way the
  disk/partitioning is handled today.

  This happens in case the root partition is not the only partition that
  is specified and not the last one (of the up to three possible
  partitions on a DASD ECKD disk), an installation may fail in case an
  ext4 filesystem is used for root.

  A workaround is to ensure that the root partition is specified as the **last** (or only) partition, like for example:
  1st partition: /boot
  2nd partition: swap
  3rd partition: / (root)
  _____

  Please try a 26.04 beta (or daily) test installation (using largely
  the defaults) on z/VM with DASD disks.

  (https://cdimage.ubuntu.com/ubuntu-server/daily-live/20260329/ or
  better latest daily:)

  https://cdimage.ubuntu.com/ubuntu-server/daily-live/current/

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