[Bug 2038906] Re: Mantic ISOs are around 700MB larger than mantic legacy ISOs

[Steve Langasek]

It is not just a new installer.  It is also new install targets (TPM
FDE) that require new squashfs layers.

There are some gains to be made by reducing duplication between some of
the layers (minimal.standard.enhanced-secureboot.squashfs and
minimal.enhanced-secureboot.squashfs should not ship the snaps, we
should figure out how to put all of these in the minimal layer as
preseeding and ensure they get removed from the target when doing a non-
enhanced-secureboot install; and kernel debs should not be duplicated
between the live layer and the package pool).  But this work is not
going to be done in mantic.

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https://bugs.launchpad.net/bugs/2038906

Title:
  Mantic ISOs are around 700MB larger than mantic legacy ISOs

Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  Mantic ISOs are around 700MB larger than mantic legacy ISOs. That's
  500MB-600MB more than I'd expect from just the new installer.

  For example 2023-10-10:
  mantic-desktop-amd64.iso: 4.8GB
  mantic-desktop-legacy-amd64.iso: 4.1GB

  Digging into the ISOs shows where the difference is:

  mantic-desktop-amd64.iso:/casper:
  ...
  277	minimal.standard.enhanced-secureboot.squashfs
  291	minimal.enhanced-secureboot.squashfs
  413	minimal.standard.squashfs
  777	minimal.standard.live.squashfs
  1654	minimal.squashfs
  3737	total

  mantic-desktop-legacy-amd64.iso:/casper:
  ...
  2873	filesystem.squashfs
  2990	total

  More info:
  https://docs.google.com/spreadsheets/d/e/2PACX-1vSmQLXuDO0E-tKnWcgjL3Ua2bWDeUg4ICZIfuMrrZndBrYjbVLKAWlKuiZLZ9EOrj4N1WV37DRg8GyW/pubchart?oid=2040836911&format=interactive

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