[Bug 1164809] [NEW] Install formats partitions and copies files before config is conplete

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when installing Ubuntu 13.04 i386 image downloaded on 4  April 2013, the
install asked me what to do with the drive. i choose to keep the
existing partitions, but to format the file systems on those drives. The
partition manager stated that this action was undoable at this time.
Next i went to set up the keyboard, at which point the X server crashed
due to a bug that likely has many bug reports already. when i went to
reboot the system, instead of the old system, i was greeted by a Grub
error 2. Booting to another Ubuntu live cd, i was able to see those two
partitions, but found that the root file system contained Ubuntu 13.04
files.

The installer should not touch the existing system until the user is
actually ready, as at the end of the install configuration. it
especially should not do so after the partition manager tool clearly
states that the actions taken there can be undone! fortunately, for me
this is a test system that has nothing on it, but imagine if this was my
main machine. what if i change my mind about installing Ubuntu before i
finish answering the configuration questions? what if the power fails?

In past releases, nothing was changed on the old system until the user
specifically presses an Install now button after the configuration
questions are all answered. This is what I expected to happen this time.

I assume that this is done to install things in the background while the
user is answering questions to make the total install time shorter, and
that is OK. However, it is not OK to change this behaviour with out
telling us in the installer, nor is it OK to explicitly state that the
partition action is undoable when, once the user clicks to the next
window, it becomes undoable.

This is a major issue because it can cause the loss of someone's system.

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


** Tags: bot-comment
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Install formats partitions and copies files before config is conplete
https://bugs.launchpad.net/bugs/1164809
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