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

[Jonas Thiem]

Well basically I had an existing Fedora installation, which is now
gone..

I would assume ext4 doesn't trigger it because the installer knows what
it is. It might have failed to revert my luks/lvm/whateveritwas maybe
because it didn't recognize it?

I would have to guess what Fedora set up in detail, so I can't tell you
for sure.

Anyway, if you do actually write to disk but revert, I think that's
utterly broken too. What if the pc is carelessly shutdown because the
user assumes no changes were finalized yet? Give at least some sort of
warning popup before you actually touch the disk like the debian text-
based installer does before writing and activating the dm-crypt stuff -
currently it's really out of the blue.

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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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