[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]

Apparently, all dm crypt stuff gets written to disk instantly without
the slightest warning. Resize or actually doing the install gives me a
big warning popup before it goes to disk though - why this stupid
inconsistency that has just cost me a lot of data?

It seems outdated that the installer doesn't use some sort of commit
system at all (where no change gets EVER written to disk, and you can
first try around and before a final confirm it shows you all steps in
all detail). It seems it kinda tries to do that with the formatting and
alerting me before it does that, but it doesn't for a lot of other big
changes.

Compare Red Hat's anaconda or gparted for how to do this stuff properly
- this current half-hearted attempt is just deceiving and user-hating.
Do you want people to accidentally lose their data? This is how you make
people accidentally lose their data.

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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 base-installer package in Ubuntu:
  New

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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