ubiquity crashed with KeyError in partman_edit_dialog()

[tdflanders]

Binary package hint: ubiquity

thomas@thomas-laptop:~$ lsb_release -rd ; uname -a ; apt-cache policy linux ubiquity
Description: Ubuntu jaunty (development branch)
Release: 9.04
Linux thomas-laptop 2.6.28-4-generic #5-Ubuntu SMP Fri Dec 26 22:48:51 UTC 2008 i686 GNU/Linux
linux:
  Installed: 2.6.28.4.4
  Candidate: 2.6.28.4.4
  Version table:
 *** 2.6.28.4.4 0
        500 http://archive.ubuntu.com jaunty/restricted Packages
        100 /var/lib/dpkg/status
ubiquity:
  Installed: (none)
  Candidate: 1.11.1
  Version table:
     1.11.1 0
        500 http://archive.ubuntu.com jaunty/main Packages
thomas@thomas-laptop:~$

ProblemType: Crash
Architecture: i386
Dependencies:

DistroRelease: Ubuntu 9.04
ExecutablePath: /usr/lib/ubiquity/bin/ubiquity
InterpreterPath: /usr/bin/python2.5
Package: ubiquity None [modified: /var/lib/dpkg/info/ubiquity.list]
ProcAttrCurrent: unconfined
ProcCmdline: /usr/bin/python /usr/lib/ubiquity/bin/ubiquity gtk_ui
ProcEnviron: Error: [Errno 13] Permission denied: '/proc/8997/environ'
PythonArgs: ['/usr/lib/ubiquity/bin/ubiquity', 'gtk_ui']
SourcePackage: ubiquity
Title: ubiquity crashed with KeyError in partman_edit_dialog()
Uname: Linux 2.6.28-4-generic i686
UserGroups: