[Bug 2125496] Re: z3fold no longer exists; use zsmalloc instead

[Dave Jones]

The corresponding change is now in a PR [1] to fix this on freshly built
images, but a quirk will need adding to u-r-u to remove it from
upgraders (noticed when testing a plucky->questing upgrade); adding
u-r-u as affected.

[1]: https://github.com/canonical/pi-gadget/pull/142

** Also affects: ubuntu-release-upgrader (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Triaged

** Changed in: ubuntu-release-upgrader (Ubuntu)
   Importance: Undecided => Medium

** Changed in: ubuntu-release-upgrader (Ubuntu)
     Assignee: (unassigned) => Dave Jones (waveform)

** Changed in: ubuntu-release-upgrader (Ubuntu)
    Milestone: None => ubuntu-25.10

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https://bugs.launchpad.net/bugs/2125496

Title:
  z3fold no longer exists; use zsmalloc instead

Status in ubuntu-raspi-settings package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader package in Ubuntu:
  Triaged

Bug description:
  The z3fold module no longer exists in kernel 6.17 (causing errors in
  the kernel dmesg output); zsmalloc is the replacement. This will also
  need a corresponding change in the kernel cmdline in the pi-gadget
  repo.

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