[Bug 2028213] Re: ISOs with the new installer are 34% bigger than legacy ISOs

[Michael Hudson-Doyle]

I guess at some point in the construction of the minimal.standard.live
layer, the /var/lib/snapd/seed/snaps directory got deleted and
recreated. The way overlayfs represents this is not very helpful to the
construction of minimal overlay squashfses :(

It seems I sort of predicted this situation in my comment here
https://git.launchpad.net/livecd-rootfs/tree/live-
build/lb_chroot_layered#n135

(on my list of things-i-want-to-look-at-but-have-never-got-around-to is
seeing if rsyncing the layer into a fresh overlay is a better way of
implementing reduce_pass_size)

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https://bugs.launchpad.net/bugs/2028213

Title:
  ISOs with the new installer are 34% bigger than legacy ISOs

Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  For example:
  mantic-desktop-legacy-amd64.iso | 2023-07-18 09:06 | 3.8G (https://cdimage.ubuntu.com/daily-legacy/)
  mantic-desktop-amd64.iso | 2023-07-18 08:28 | 5.1G (https://cdimage.ubuntu.com/daily-live/)

  Slightly less severe in lunar:
  ubuntu-23.04-desktop-legacy-amd64.iso | 2023-04-17 22:28 | 3.6G (https://cdimage.ubuntu.com/releases/23.04/release/)
  ubuntu-23.04-desktop-amd64.iso | 2023-04-18 21:06 | 4.6G (https://releases.ubuntu.com/23.04/)

  First reported in:
  https://github.com/canonical/ubuntu-desktop-installer/issues/2253

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