[Bug 1953407] Re: [MIR] lz4 (again!)

[Christian Ehrhardt ]

Hi,
in the past we have handled such re-promotions rather lightly as long as the project had no major changes.

Foundations was and still is subscribed (for the older releases), so
that is ok as well.

The delta between hirsute (in main) and jammy (to be promoted) is nearly
none and negligible.

No need for MIR or Security team re-review.
MIR Team ack for re-promotion in Jammy.

I think you can go ahead and nudge an AA to help you do that.

** Changed in: lz4 (Ubuntu)
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/1953407

Title:
  [MIR] lz4 (again!)

Status in lz4 package in Ubuntu:
  Fix Committed

Bug description:
  Between the xenial (16.04) and hirsute (21.04) releases, lz4 was in
  main, and after 2019 was used by default for initramfs compression. In
  impish onwards, that compression was changed to zstd by default and
  lz4 was demoted to universe.

  Unfortunately, zstd is unsuitable for low-memory / slow platforms such
  as the relatively new Pi Zero 2 (or the older 3A+) which both have
  only 512MB of RAM (see LP: #1950214 for further details). As such, we
  need lz4 back in main to support (at least) the Pi images.

  As this could be considered a re-hash of the previous MIR in LP:
  #1531923, I've not (yet) included the usual MIR sections as I'm not
  sure a full (re-)review is required? If it is, I'm happy to provide an
  updated set.

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