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

[Phillip Susi]

Bingo!  I tried zeroing out the first 64 sectors of the existing (ext4)
partition before running the installer so it wouldn't recognize it, and
it reports the partition as unrecognized.  Changing its type to crypto
still does not change the contents of the disk, and if I quit the
installer and restore the first 64k, it works fine.  HOWEVER, if I start
with an existing crypto install, the installer also reports that it does
not recognize the partition type ( possibly a separate bug ) and now if
I change its type to crypto, it indeed does immediately commit the the
changes to disk, destroying the previous luks container.

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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:
  Triaged

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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