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

[Dan Bungert]

The edge/lp-2101831-v2 snap is based on main branch subiquity + this commit:
https://git.launchpad.net/~dbungert/curtin/commit/curtin/commands/curthooks.py?id=6c5c7a7ad46589dbb230290e993fa12b6ae0cdd3

There are two relevant changes:
* move zipl invocation later, after we expect the initrd is in good order
* use dpkg-reconfigure on the kernel to run postinstall scripts, which includes fixing initrd symlinks and should also cause zipl to run

Curtin's zipl invocation sounds redundant now, but I'm leaving it to
match more closely the previous curtin behavior.

I will work on testing the above some more and landing it in curtin then
subiquity.

** Changed in: subiquity (Ubuntu)
     Assignee: (unassigned) => Dan Bungert (dbungert)

** Changed in: subiquity (Ubuntu)
    Milestone: None => ubuntu-25.04-beta

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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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