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

[Jonas Thiem]

More detail: I could try again in a VM, but this should be the process
to make it work:

1. Create LVM with LUKS (sadly I can't recall if LUKS was inside LVM or the other way round)
2. Open installer which recognizes the partition but doesn't realize what it is
3. Click partition, click edit, choose the encryption container thing for the partition

At this point, the installer suddenly becomes very busy, /dev/mapper
things appear at the top and there's some short statements about
reloading info from disk is on the screen.

If you quit at this point by clicking "Quit" (NOT "back"), your LVM/LUKS
partition should be destroyed and unable to boot. Might still be
recognized, but shouldn't load up anymore.

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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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