[Bug 891711] Re: "Upgrade" from 11.10 to 11.04 results in a unusable system

[Steve Langasek]

** Also affects: ubuntu-release-notes
   Importance: Undecided
       Status: New

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Title:
  "Upgrade" from 11.10 to 11.04 results in a unusable system

Status in Release Notes for Ubuntu:
  New
Status in “ubiquity” package in Ubuntu:
  New

Bug description:
  If one has a running Ubuntu 11.10 system and then boots an Ubuntu
  11.04 CD and chooses to install Ubuntu you are presented with an
  option to "Upgrade from 11.10 to 11.04".  Choosing this option results
  in a crash.

  Presumably the same thing would happen if you were to install 12.04
  and then boot an 11.10 CD.

  TEST CASE
  1) Install Ubuntu 11.10
  2) Try to reinstall Ubuntu 11.04 (because you are dissatisfied with the new release for some reason)
  3) At the allocate drive space screen choose "Upgrade 11.10 to 11.04" (because you don't want to lose your data)
  4) During the copying files phase observe a crash

  After the crash ubiquity became non-responsive and I went to a tty to
  reboot the system.  The system fails to boot after choosing either the
  regular or recovery boot option from 11.10.

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