[Bug 1462632] Re: "Editing" unknown partition to Crypt to see if crypt detected instantly destroys what was there, "Quit" does not revert

[Jonas Thiem]

Did you do take a look at Red Hat's anaconda installer by the way? It
never touches the disk ever and lets you plan the whole thing including
crypto setup, creating/changing partitions etc, and then when submitting
the whole thing, gives you a verbose listing of changes that will be
done with a big "do it and ruin my disk" finalizing button.

Compared to ubiquity's current nontransparent sometimes-happens-
immediately-sometimes-later with sometimes warning and sometimes no
warning behavior, it seems light years ahead in technology. I was really
caught by surprise that it immediately touched the disk without even the
slightest warning, and then failed to revert it correctly.

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https://bugs.launchpad.net/bugs/1462632

Title:
  "Editing" unknown partition to Crypt to see if crypt detected
  instantly destroys what was there, "Quit" does not revert

Status in ubiquity package in Ubuntu:
  Incomplete

Bug description:
  In the graphical desktop installer, "Editing" unknown partition to
  crypt to see if LVM or crypto is detected instantly destroys what was
  there, "Quit" does not revert: https://i.stack.imgur.com/p0SWz.png

  This is a horrible thing to do because:
  1.) why would you not detect LVM in the first place
  2.) why is there no warning that you're just destroying data. Not that you don't even have a proper commit system (every partitioning tool I have seen except command line DOS stuff will let me try changes first, then APPLY them when I choose so AFTER A WARNING), but there is no warning at all
  3.) you do even have a revert button, but clicking "Quit" apparently doesn't trigger that and my partitions are left broken

  TL;DR: I tried to make it detect my LVM, quitted with "Quit" since
  apparently it can't, and now my LVM is gone forever.

  1995 is calling and wants its horrible partitioning GUI back!! Also,
  thanks for wasting all my data.

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