[Bug 1968150] Re: [FFe] Remove zsys from installer

[Dimitri John Ledkov]

ZFS is the future.

It is more reliable, and allows one to optimally use theirs to full
potential without being limited by re-partitioning.

ZFS installation options are present with and without encryption in
Jammy desktop installer, and the legacy desktop installer in Lunar, with
the critical bug
https://bugs.launchpad.net/ubuntu/+source/zsys/+bug/1993318 fixed up.
Said bug has caused us concern during Kinetic release week, and we made
the decision to temporary hide the encrypted zfs option in the Kinetic
desktop released ISO. One can however use Jammy desktop installer and
then dist-upgrade.

zsys is a great tool for managing snapshots and rollbacks. It is
available from the ubuntu archive with `sudo apt install zsys`. And all
other pieces of integration remain in place to support it (i.e. grub /
systemd). It is not currently installed by default, because it requires
infrequent manual actions from the user to manage certain snapshots that
are not automatically reclaimed. Hopefully these aspects of zsys will be
improved in the future -> for example allow installation of zsys with
automatic snapshoting turned off, but allow one to opt into it.

Separately even on non-zfs installations LXD uses zfs as the default
storage pool format.

There are ongoing plans and efforts to continue develop, support and
expand zfs use in Ubuntu and elsewhere.

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https://bugs.launchpad.net/bugs/1968150

Title:
  [FFe] Remove zsys from installer

Status in ubiquity package in Ubuntu:
  Fix Released

Bug description:
  Zsys is in very low maintenance mode (critical bug fixes only) and must be removed from the LTS.
  However ZFS and encrypted ZFS are still available as an installation option but the package ZSys is not installed.
  The ZFS layout remains unchanged.

  https://git.launchpad.net/ubiquity/commit/?id=76e7718dbdd9dde7a7609f754cf8719469bbf0e5

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