[Bug 939450] Re: ubiquity crashed with TypeError: argument of type 'NoneType' is not iterable in ubi-partman.py

[amay82]

Present in 12.04 beta1 for AMD64, not possible to install.

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Title:
  ubiquity crashed with TypeError: argument of type 'NoneType' is not
  iterable in ubi-partman.py

Status in “ubiquity” package in Ubuntu:
  In Progress
Status in “ubiquity” source package in Precise:
  In Progress

Bug description:
  TEST CASE
  1. Boot from a Live CD
  2. At ubiquity-dm select 'Install Ubuntu'
  3. Proceed to partman and select 'Something else' (manual partitioning)

  ACTUAL RESULT
  The partition list is empty and ubiquity crash with:

   Traceback (most recent call last):
     File "/usr/lib/ubiquity/plugins/ubi-partman.py", line 593, in partman_column_name
       if 'id' not in partition:
   TypeError: argument of type 'NoneType' is not iterable

  EXPECTED RESULT
  The partition list is displayed.

  Tested with ubiquity 2.9.20

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