ubiquity crashed with IndexError in render_slider()

[ubuntu_giant]

Binary package hint: ubiquity

It happens whenever I click on the radio button to manually edit the disk partition.

ProblemType: Crash
Architecture: i386
Date: Wed Aug 26 16:40:47 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/lib/ubiquity/bin/ubiquity
InterpreterPath: /usr/bin/python2.6
LiveMediaBuild: Ubuntu 9.10 "Karmic Koala" - Alpha i386 (20090812.3)
Package: ubiquity 1.99.6
ProcCmdline: /usr/bin/python /usr/lib/ubiquity/bin/ubiquity gtk_ui
ProcEnviron: Error: [Errno 13] Permission denied: '/proc/7479/environ'
ProcVersionSignature: Ubuntu 2.6.31-5.24-generic
PythonArgs: ['/usr/lib/ubiquity/bin/ubiquity', 'gtk_ui']
SourcePackage: ubiquity
Title: ubiquity crashed with IndexError in render_slider()
Uname: Linux 2.6.31-5-generic i686
UserGroups: