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Bug#368633: partman: LVM automatic partitioning not undoable

Package: partman
Severity: critical
Justification: causes serious data loss

I burned a D-I image for a friend (the latest weekly Debian CD as of Mar
12 15:12) and chose to play with it a bit to see if it was clearly
broken in some obvious way or likely okay for out purposes.

Once I had verified enough that I thought the build was fine (and It did
work for the install), I decided to try out the LVM option in the
"guided partitioning", since I had never done so before and I wanted to
see what how it would arrange the partitions.  The guided partitioning
page clearly states that you will have a chance to review and undo the
guided partitioning, and is correct for regular partitions, but LVM
occurs immeditely, it seems, and even gpart was unable to restore my
data.  I was able to salvage the python programs I had been working on,
but nothing else.

Since there is almost certainly a reason LVM gets applied immeditely,
most likely that cannot be changed, but I am of the opinion that the
diolog where you can select it should clearly state that the operation
cannot be undone and may well kill working installations.

-- System Information:
Debian Release: testing/unstable
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.16-eriix
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)

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