[Bug 1462632] Re: "Editing" unknown partition to LVM to see if LVM is detected instantlzy destroys what was there, "Quit" does not revert

[Jonas Thiem]

Ubuntu 15.04, the screenshot is just googled to illustrate the page I
was on (it's not reflecting my settings either) - and when hitting
"Quit", it quite happily destroyed things. I can't tell if "Back" would
have saved me.

It might have been the crypt option. What I certainly remember is
selecting the unknown partition (which was the encrypted luks lvm of my
previous install), clicking edit, choosing something which I hoped might
be the right thing to open it up (something along the lines of an
"encrypted container" choice or what it has? I don't think it wasn't
explicitely named LVM or dm-crypt), and then I had dev mappers appear at
the top. I discovered it would want to create something new instead of
accessing my existing stuff, so I clicked "Quit" - but at that point, it
has already written stuff to disk.

Again if you check the base installer, it does the same thing before
allowing you to use the mappers after you specify dm-crypt for some
partition - writing the LVM or dm-crypt to disk. I guess this was
adapted at this point for similar behavior. However, the text installer
doesn't do that *without any warning*, unlike ubiquity seems to do..

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

Title:
  "Editing" unknown partition to LVM to see if LVM is detected
  instantlzy 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 LVM
  to see if LVM is detected instantlzy 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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