biquity crashed with KeyError in partman_edit_dialog(): 'method_choices'

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Ubi-partmen failed with exit code 141 turing 12.04LTS live custom installation.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: ubiquity 2.9.2
ProcVersionSignature: Ubuntu 3.1.0-2.3-generic 3.1.0
Uname: Linux 3.1.0-2-generic x86_64
ApportVersion: 1.26-0ubuntu1
Architecture: amd64
CasperVersion: 1.290
CrashCounter: 1
Date: Sun Nov 13 10:19:16 2011
ExecutablePath: /usr/lib/ubiquity/bin/ubiquity
InterpreterPath: /usr/bin/python2.7
LiveMediaBuild: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20111112)
ProcCmdline: /usr/bin/python /usr/lib/ubiquity/bin/ubiquity gtk_ui
ProcEnviron: Error: [Errno 13] Permission denied: '/proc/13680/environ'
PythonArgs: ['/usr/lib/ubiquity/bin/ubiquity', 'gtk_ui']
SourcePackage: ubiquity
Title: ubiquity crashed with KeyError in partman_edit_dialog(): 'method_choices'
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

[Robert Roth (evfool)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug #885654, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.