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

[cokekid]

OK im still a little new at this but i upgraded from 11.04 to 11.10 to
12.04 now i want to go back to 11.10 clean install or at least a
downgrade and that's where the problem starts. OH I'm also duel booted
with win-xp. So I ran the live DVD disk of 11.10 and I tell it I want to
install, then I select language, the next screen that I see is the
partition window, there it says that I dont have any OS's on my HDD. OH
BTW (dell Inspiron 9400)..... So now i have to back up every thing on
win xp and deal with hrs of BS of updates....HELP... when I boot my pc
up it loads with out problems all OS's are here .......

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https://bugs.launchpad.net/bugs/891711

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:
  Triaged
Status in “ubiquity” source package in Natty:
  Won't Fix
Status in “ubiquity” source package in Oneiric:
  Confirmed
Status in “ubiquity” source package in Precise:
  Triaged

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.

  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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