ubiquity crashed with RuntimeError in progress_loop()

[Stooball]

Binary package hint: ubiquity

Don't know why - I was trying to install Ubuntu 9 alongside windows XP and it failed With the Ubiquity problem - a report was generated and supposedly sent to those who know what to do with it
!.

ProblemType: Crash
Architecture: i386
DistroRelease: Ubuntu 9.04
ExecutablePath: /usr/lib/ubiquity/bin/ubiquity
InterpreterPath: /usr/bin/python2.6
MediaBuild: Ubuntu 9.04 "Jaunty Jackalope" - Release i386 (20090420.1)
Package: ubiquity 1.12.12
ProcAttrCurrent: unconfined
ProcCmdline: /usr/bin/python /usr/lib/ubiquity/bin/ubiquity gtk_ui
ProcEnviron: Error: [Errno 13] Permission denied: '/proc/5844/environ'
PythonArgs: ['/usr/lib/ubiquity/bin/ubiquity', 'gtk_ui']
SourcePackage: ubiquity
Title: ubiquity crashed with RuntimeError in progress_loop()
Uname: Linux 2.6.28-11-generic i686
UserGroups: