[Bug 857291] Re: ubiquity crashed with TypeError in __new__(): object of type 'NoneType' has no len()

[Apport retracing service]

*** This bug is a duplicate of bug 838048 ***
    https://bugs.launchpad.net/bugs/838048

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 #838048, 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/857291/+attachment/2446558/+files/Dependencies.txt

** Attachment removed: "ProcMaps.txt"
   https://bugs.launchpad.net/bugs/857291/+attachment/2446560/+files/ProcMaps.txt

** Attachment removed: "ProcStatus.txt"
   https://bugs.launchpad.net/bugs/857291/+attachment/2446561/+files/ProcStatus.txt

** This bug has been marked a duplicate of private bug 838048

** Visibility changed to: Public

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https://bugs.launchpad.net/bugs/857291

Title:
  ubiquity crashed with TypeError in __new__(): object of type
  'NoneType' has no len()

Status in “ubiquity” package in Ubuntu:
  New

Bug description:
  Installing alongside Xubuntu Natty,  importing my 11.04 account settings,  and the installation claimed to be finished; I was then quickly switched to a live disc session and thrown the crash notice.  When I received the message about the installation being finished,  I was currently on the web based IRC launched through the link in the ubiquity installer.  When I attempted to launch a second tab in Firefox,  to navigate to another web-page,  the installation finished message popped up,  then everything started shutting down and I found myself in a live disc environment with the crash notice.    
  I immediately logged in here,  so I have not rebooted;  as is required for the ubiquity bug reporting guidelines.

  ProblemType: Crash
  DistroRelease: Ubuntu 11.10
  Package: ubiquity 2.7.25
  ProcVersionSignature: Ubuntu 3.0.0-9.15-generic 3.0.3
  Uname: Linux 3.0.0-9-generic x86_64
  Architecture: amd64
  CasperVersion: 1.280
  Date: Fri Sep 23 10:37:23 2011
  ExecutablePath: /usr/lib/ubiquity/bin/ubiquity
  InterpreterPath: /usr/bin/python2.7
  LiveMediaBuild: Xubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110901)
  ProcCmdline: /usr/bin/python /usr/lib/ubiquity/bin/ubiquity --only
  ProcEnviron: Error: [Errno 13] Permission denied: '/proc/3236/environ'
  PythonArgs: ['/usr/lib/ubiquity/bin/ubiquity', '--only']
  SourcePackage: ubiquity
  Title: ubiquity crashed with TypeError in __new__(): object of type 'NoneType' has no len()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

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