[Bug 1391828] [NEW] During upgrade, user is able to quit without warning

[James Tait]

Public bug reported:

I wanted to upgrade a laptop from 12.04.5 to 14.04.1 using the USB
installer. Ubiquity correctly detected my existing installation and I
selected to upgrade that. Due to Bug #763075 I was then prompted to
choose a username and password for my "new" installation. Thinking I'd
chosen the wrong option (because an upgrade wouldn't need me to create a
new user, right?) I wanted to go back to the partman screen.

The details here are a little hazy, but I think the back button and quit
button were both greyed out. However, I was able to right-click the
Ubiquity icon in the launcher and select Quit from the quick menu. I may
have seen a dialogue box asking if I was sure, with Cancel and Quit
buttons, but I don't recall exactly (I've been through the installer
several times since, trying to recover things, so I may be remembering
that dialogue from one of those attempts). I definitely did not see a
prominent warning to the effect of "We've already started deleting your
old installation, if you quit now, you'll hose your system."

Anyway, I was able to quit Ubiquity, and I then rebooted, thinking maybe
I could insert the USB stick in the running 12.04 session and upgrade
from there (is that still possible?). But the system failed to boot, and
upon further inspection after booting from the USB again, I see a lot of
the old system has been deleted, including /etc - so now Ubiquity
doesn't even detect that it was a previous Ubuntu installation (because
there's no /etc/lsb-release - though even restoring that file hasn't
enabled the upgrade option again, I can only install alongside, or wipe
the disk and install from scratch).

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1391828

Title:
  During upgrade, user is able to quit without warning

Status in “ubiquity” package in Ubuntu:
  New

Bug description:
  I wanted to upgrade a laptop from 12.04.5 to 14.04.1 using the USB
  installer. Ubiquity correctly detected my existing installation and I
  selected to upgrade that. Due to Bug #763075 I was then prompted to
  choose a username and password for my "new" installation. Thinking I'd
  chosen the wrong option (because an upgrade wouldn't need me to create
  a new user, right?) I wanted to go back to the partman screen.

  The details here are a little hazy, but I think the back button and
  quit button were both greyed out. However, I was able to right-click
  the Ubiquity icon in the launcher and select Quit from the quick menu.
  I may have seen a dialogue box asking if I was sure, with Cancel and
  Quit buttons, but I don't recall exactly (I've been through the
  installer several times since, trying to recover things, so I may be
  remembering that dialogue from one of those attempts). I definitely
  did not see a prominent warning to the effect of "We've already
  started deleting your old installation, if you quit now, you'll hose
  your system."

  Anyway, I was able to quit Ubiquity, and I then rebooted, thinking
  maybe I could insert the USB stick in the running 12.04 session and
  upgrade from there (is that still possible?). But the system failed to
  boot, and upon further inspection after booting from the USB again, I
  see a lot of the old system has been deleted, including /etc - so now
  Ubiquity doesn't even detect that it was a previous Ubuntu
  installation (because there's no /etc/lsb-release - though even
  restoring that file hasn't enabled the upgrade option again, I can
  only install alongside, or wipe the disk and install from scratch).

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