[Bug 1847806] Re: eoan: ppc64el install on pseries-eoan VM fails to install

[Christian Ehrhardt ]

To get a better hold of the actual bad instruction I installed Ubuntu
19.10 in a guest using the 3.1 based machine type. Then after the full
install (much more capable than the busybox of the installer) I switched
the machine type and booted up with the new machine type that also
implies the power9 cpu.

With that it still boots up, but I've seen a few illegal instructions.

On login I see /etc/update-motd.d/98-fsck-at-reboot, also apt install of gdb failed.
In the journal I have found 8 more.

I can't install anything, so it seems I need to switch back and forth between CPU types whenever I need anything on top ...
But now (full install) fortunately the crash collection in /var/crash worked so I have a few dumps to check.

With the older emulated CPU I then went into debugging these cases to
check for a common pattern ...

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https://bugs.launchpad.net/bugs/1847806

Title:
  eoan: ppc64el install on pseries-eoan VM fails to install

Status in The Ubuntu-power-systems project:
  Incomplete
Status in debian-installer package in Ubuntu:
  Invalid
Status in glibc package in Ubuntu:
  New
Status in qemu package in Ubuntu:
  Confirmed

Bug description:
  Using today's ppc64el server iso, I tried to install this on a
  pseries-eoan VM hosted on a large x86 desktop server and it failed to
  install.

  VM: 2GB memory, 20GB virtio qcow, CPUs: 2

  Installer options:
  Language: English
  Location: United Kingdom
  Detect keyboard layout? No
  Keyboard: English (UK)
  Keyboard Layout: English (UK)
  Hostname: ubuntu
  Full name for the new user: cking
  Username for your account: cking
  Choose a password for the new user: ************
  Re-enter password to verify: ************
  Partitioning method: Guided - use entire disk
  Select disk to partition: Virtual disk 1 (vda) - 21.5 GB Virtio Block Device
  Write the changes to discs? Yes

  Then installer stopped and I cannot progress. See the attached photo
  of the failure.

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