Hi Martin,

In VarLogDistupgradeMainlog.txt

you have a woanderfull stacktrace:

Traceback (most recent call last):

  File "/tmp/ubuntu-release-upgrader-406zz2/raring", line 10, in <module>
    sys.exit(main())

  File "/tmp/ubuntu-release-upgrader-406zz2/DistUpgrade/DistUpgradeMain.py", 
line 240, in main
    if app.run():

  File 
"/tmp/ubuntu-release-upgrader-406zz2/DistUpgrade/DistUpgradeController.py", 
line 1769, in run
    return self.fullUpgrade()

  File 
"/tmp/ubuntu-release-upgrader-406zz2/DistUpgrade/DistUpgradeController.py", 
line 1668, in fullUpgrade
    if not self.updateSourcesList():

  File 
"/tmp/ubuntu-release-upgrader-406zz2/DistUpgrade/DistUpgradeController.py", 
line 818, in updateSourcesList
    _("Some third party entries in your sources.list "

  File 
"/tmp/ubuntu-release-upgrader-406zz2/DistUpgrade/DistUpgradeViewText.py", line 
138, in information
    sys.stdin.readline().decode(ENCODING, "backslashreplace")

TypeError: decode() argument 1 must be string, not None

** Tags added: quantal2raring

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https://bugs.launchpad.net/bugs/1106081

Title:
  TypeError from do-release-upgrade when LANG=C

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