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[Launchpad Bug Tracker <992241@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package partman-target - 77ubuntu2.1

---------------
partman-target (77ubuntu2.1) precise-proposed; urgency=low

  * finish.d/clear_partitions: Don't remove /var/lib/mysql or
    /var/lib/mythtv, since they contain user data in the form of databases
    (LP: #992241).
 -- Colin Watson <cjwatson@xxxxxxxxxx>   Wed, 04 Jul 2012 15:12:53 +0100

** Changed in: partman-target (Ubuntu Precise)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/992241

Title:
  Upgrading using the live cd wipes /var/lib/mythtv/*

Status in Mythbuntu, Ubuntu derivative focused upon MythTV:
  Confirmed
Status in “partman-target” package in Ubuntu:
  Fix Released
Status in “ubiquity” package in Ubuntu:
  Fix Released
Status in “partman-target” source package in Precise:
  Fix Released
Status in “ubiquity” source package in Precise:
  Triaged

Bug description:
  [Impact] Serious data loss when using the live CD upgrade option.
  [Test Case] Install 11.10.  Create some files under /var/lib/mysql/ and /var/lib/mythtv/ (doesn't matter exactly what).  Use the live CD upgrade option to upgrade to 12.04 using an in-place install.  Check that the files you created still exist.
  [Regression Potential] Limited to the upgrade option; this code is not used elsewhere.  If that option still works otherwise then it should be fine.

  Original report follows:

  When using the live cd to upgrade, it wipes /var/lib/mythtv/*
  (presumably /var/*) meaning you lose the database and the default
  storage group locations

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