[Bug 1960255] [NEW] Prevent do-release-upgrades on P8 systems from focal or impish to jammy

[Frank Heimes]

Public bug reported:

Starting with Ubuntu Server 22.04 ppc64el is compiled for Power 9 processors.
Prior to 22.04 it was/is compiled for Power 8 processors.
Hence P8 processors are not able to run, install or upgrade to jammy.

So do-release-upgrades on a Power 8 system from last LTS (focal) or last
non-LTS (impish) <afaik these are the only two supported options> to
jammy should be prevented.

** Affects: ubuntu-power-systems
     Importance: Undecided
     Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
         Status: New

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
     Assignee: Canonical Foundations Team (canonical-foundations)
         Status: New


** Tags: jammy ppc64el rls-ff-incoming

** Also affects: ubuntu-power-systems
   Importance: Undecided
       Status: New

** Changed in: ubuntu-power-systems
     Assignee: (unassigned) => Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)

** Tags added: jammy

** Tags added: rls-ff-incoming

** Description changed:

  Starting with Ubuntu Server 22.04 ppc64el is compiled for Power 9 processors.
  Prior to 22.04 it was/is compiled for Power 8 processors.
  Hence P8 processors are not able to run, install or upgrade to jammy.
  
  So do-release-upgrades on a Power 8 system from last LTS (focal) or last
- non-LTS (impish) to jammy should be prevented.
+ non-LTS (impish) <afaik these are the only two supported options> to
+ jammy should be prevented.

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https://bugs.launchpad.net/bugs/1960255

Title:
  Prevent do-release-upgrades on P8 systems from focal or impish to
  jammy

Status in The Ubuntu-power-systems project:
  New
Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  Starting with Ubuntu Server 22.04 ppc64el is compiled for Power 9 processors.
  Prior to 22.04 it was/is compiled for Power 8 processors.
  Hence P8 processors are not able to run, install or upgrade to jammy.

  So do-release-upgrades on a Power 8 system from last LTS (focal) or
  last non-LTS (impish) <afaik these are the only two supported options>
  to jammy should be prevented.

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