[Bug 1586825] Re: installer formats disk although "Back" was clicked to return to previous screen

[Simon Quigley]

** Changed in: ubiquity (Ubuntu)
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/1586825

Title:
  installer formats disk although "Back" was clicked to return to
  previous screen

Status in ubiquity package in Ubuntu:
  Won't Fix

Bug description:
  I am running Ubuntu 14.04 on a computer with three harddisks. I need
  to install 16.04 on a specific disk so I disconnected two of the three
  disks and booted the 16.04 install via USB (EFI).

  The disk in question at that time hosted an encrypted LVM volume with
  data only which I was able to mount in the 16.04 live system using
  Nautilus (but not access, possibly due to mismatching user IDs).

  I started the installer on the desktop and selected to install updates and encrypt the system.
  I clicked through UNTIL the point where an additional popup window told me that it would now format the disks with the following layout (...) if I proceed.

  At that point I backed out and clicked "Back" several times, going
  back several steps until the point where I could choose whether to use
  LVM and encryption. Then I closed the installer.

  At that point, my target disk - which held a data partition before -
  was already formatted although I had backed out of the installer:

    Medium /dev/sda: 465.8 GiB, 500107862016 Bytes, 976773168 Sektoren

    Gerät        Start      Ende  Sektoren Größe Typ
    /dev/sda1     2048   1050623   1048576   512M EFI System
    /dev/sda2  1050624   2050047    999424   488M Linux filesystem
    /dev/sda3  2050048 976771071 974721024 464.8G Linux filesystem

  I am *100% sure* I did *not* click on "Proceed" at the prompt where the partitioning layout was shown.
  Please try to reproduce this, if it is reproducible it is a serious bug.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubiquity 2.21.63
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  CasperVersion: 1.376
  CurrentDesktop: Unity
  Date: Sun May 29 19:33:32 2016
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
  LiveMediaBuild: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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