[Bug 2101831] Re: 25.04 installation does not come up after post-install reboot on s390x

[Launchpad Bug Tracker]

** Merge proposal linked:
   https://code.launchpad.net/~dbungert/curtin/+git/curtin/+merge/482849

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https://bugs.launchpad.net/bugs/2101831

Title:
  25.04 installation does not come up after post-install reboot on s390x

Status in Ubuntu on IBM z Systems:
  In Progress
Status in subiquity package in Ubuntu:
  In Progress

Bug description:
  While using the plucky daily image from March 9th and performing a test installation, I've noticed that the installation does not come up after the post-install reboot was triggered ('Reboot' button).
  The system goes down, but is then not able to come up again.
  In z/VM I get the message:
  "HCPVMI232E IPL UNIT ERROR; IRB 00404017 00000010 00200000 00800000"
  points to an issue during IPL (boot).

  There are some lines in the curtin-install.log that make me wonder if the zipl boot loader was not written:
  "
  installer/curtin-install.log-Running command ['unshare', '--fork', '--pid', '--mount-proc=/target/proc', '--', 'chroot', '/target', 'update-initramfs', '-c', '-k', '6.12.0-16-generic'] with allowed return codes [0] (capture=False)
  installer/curtin-install.log-update-initramfs: Generating /boot/initrd.img-6.12.0-16-generic
  installer/curtin-install.log:Not invoking zipl: initrd doesn't exist yet
  installer/curtin-install.log-Running command ['udevadm', 'settle'] with allowed return codes [0] (capture=False)
  "

  Below I've attached the entire logs ...

  (Btw. the error msg is similar to LP1723541, but this seems to be
  unrelated, but will do some more tests.)

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