[Bug 774079] Re: ubiquity crashed with TypeError in do_set_property(): Gtk.Label.set_text() argument 1 must be string, not None

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*** This bug is a duplicate of bug 680651 ***
    https://bugs.launchpad.net/bugs/680651

Thank you for taking the time to report this crash and helping to make
Ubuntu better.  This particular crash has already been reported and is a
duplicate of bug #680651, so 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.  Please continue to report any other bugs you may
find.

** Tags removed: need-duplicate-check

** Attachment removed: "Dependencies.txt"
   https://bugs.launchpad.net/bugs/774079/+attachment/2099504/+files/Dependencies.txt

** Attachment removed: "ProcMaps.txt"
   https://bugs.launchpad.net/bugs/774079/+attachment/2099505/+files/ProcMaps.txt

** Attachment removed: "ProcStatus.txt"
   https://bugs.launchpad.net/bugs/774079/+attachment/2099506/+files/ProcStatus.txt

** This bug has been marked a duplicate of private bug 680651

** Visibility changed to: Public

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https://bugs.launchpad.net/bugs/774079

Title:
  ubiquity crashed with TypeError in do_set_property():
  Gtk.Label.set_text() argument 1 must be string, not None

Status in “ubiquity” package in Ubuntu:
  New

Bug description:
  Binary package hint: ubiquity

  I was trying to install ubuntu 11.04 - 32 bit  over my existing Ubuntu 9.04.
  I used bootable USB to install which is made bootable using windows universal usb installer.
  I found this error on mid installation. I have also windows7 installed in my laptop.

  ProblemType: Crash
  DistroRelease: Ubuntu 11.04
  Package: ubiquity 2.6.10
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
  Uname: Linux 2.6.38-8-generic i686
  Architecture: i386
  Date: Sat Apr 30 23:45:20 2011
  ExecutablePath: /usr/lib/ubiquity/bin/ubiquity
  InterpreterPath: /usr/bin/python2.7
  LiveMediaBuild: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
  ProcCmdline: /usr/bin/python /usr/lib/ubiquity/bin/ubiquity gtk_ui
  ProcEnviron: Error: [Errno 13] Permission denied: '/proc/23603/environ'
  PythonArgs: ['/usr/lib/ubiquity/bin/ubiquity', 'gtk_ui']
  SourcePackage: ubiquity
  Title: ubiquity crashed with TypeError in do_set_property(): Gtk.Label.set_text() argument 1 must be string, not None
  Traceback:
   Traceback (most recent call last):
     File "/usr/lib/ubiquity/ubiquity/gtkwidgets.py", line 398, in do_set_property
       self.label.set_text(value)
   TypeError: Gtk.Label.set_text() argument 1 must be string, not None
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: