Public bug reported:

Upgraded to Ubuntu 12.04, everything worked.
Wanted to change account name, somewhere read that reinstalling ubuntuone 
helped. After removing and installing ubuntuone again Ubuntu One control panels 
won't start.

>> controlpanel.log

2012-04-15 20:53:27,503 - ubuntuone.controlpanel.backend - INFO - 
ControlBackend: instance started.
2012-04-15 20:53:27,723 - ubuntuone.controlpanel.qt.gui - INFO - Updates 
available? None
2012-04-15 20:53:28,189 - ubuntuone.controlpanel.qt.controlpanel - ERROR - 
Error while invoking <bound method ControlPanel.load of 
<ubuntuone.controlpanel.gui.qt.controlpanel.ControlPanel object at 0x30f80e0>> 
with args () and kwargs {}:
Traceback (most recent call last):
  File 
"/usr/lib/python2.7/dist-packages/ubuntuone-control-panel/ubuntuone/controlpanel/gui/qt/__init__.py",
 line 100, in inner
    res = yield f(*args, **kwargs)
CredentialsError: dbus.Dictionary({dbus.String(u'errtype'): 
dbus.String(u'DBusException'), dbus.String(u'message'): dbus.String(u'Failed to 
create necessary plain keys.')}, signature=dbus.Signature('ss'))
2012-04-15 20:55:02,535 - ubuntuone.controlpanel.qt.controlpanel - INFO - The 
warning dialog was shown and also closed (message was u'DBusException\nFailed 
to create necessary plain keys.').

>> credentials.log

2012-04-15 20:53:27,773 - ubuntuone.credentials - DEBUG - find_credentials: 
args (<ubuntuone.platform.credentials.CredentialsManagementTool object at 
0x30ebad0>,), kwargs {}.
2012-04-15 20:53:28,013 - ubuntuone.credentials - INFO - Starting Ubuntu One 
login manager for bus u'com.ubuntuone.Credentials'.
2012-04-15 20:53:28,018 - ubuntuone.credentials - DEBUG - ref_count is 0, 
changing value to 1.
2012-04-15 20:53:28,185 - ubuntuone.credentials - DEBUG - Handling DBus signal 
for member: u'CredentialsError', app_name: dbus.String(u'Ubuntu One').
2012-04-15 20:53:28,185 - ubuntuone.credentials - INFO - u'CredentialsError'
2012-04-15 20:53:28,186 - ubuntuone.credentials - DEBUG - ref_count is 1, 
changing value to 0.
2012-04-15 20:53:28,186 - ubuntuone.credentials - DEBUG - Setting up timer with 
<built-in function timeout_add> (10000, <bound method 
CredentialsManagement.shutdown of 
<ubuntuone.platform.credentials.linux.CredentialsManagement at /credentials at 
0x2e78f90>>).
2012-04-15 20:53:28,186 - ubuntuone.credentials - ERROR - 
CredentialsManagement: emitting CredentialsError with error_dict 
dbus.Dictionary({dbus.String(u'errtype'): dbus.String(u'DBusException'), 
dbus.String(u'message'): dbus.String(u'Failed to create necessary plain 
keys.')}, signature=dbus.Signature('ss')).
2012-04-15 20:53:28,187 - ubuntuone.credentials - DEBUG - cleanup: removing 
signal match <<class 'dbus.connection.SignalMatch'> at 2e8fe90 
"type='signal',sender='com.ubuntuone.Credentials',path='/credentials',interface='com.ubuntuone.CredentialsManagement',member='CredentialsFound'"
 on conn <dbus._dbus.SessionBus (session) at 0x2fece30>>
2012-04-15 20:53:28,188 - ubuntuone.credentials - DEBUG - cleanup: removing 
signal match <<class 'dbus.connection.SignalMatch'> at 385d050 
"type='signal',sender='com.ubuntuone.Credentials',path='/credentials',interface='com.ubuntuone.CredentialsManagement',member='CredentialsNotFound'"
 on conn <dbus._dbus.SessionBus (session) at 0x2fece30>>
2012-04-15 20:53:28,189 - ubuntuone.credentials - DEBUG - cleanup: removing 
signal match <<class 'dbus.connection.SignalMatch'> at 385d1d0 
"type='signal',sender='com.ubuntuone.Credentials',path='/credentials',interface='com.ubuntuone.CredentialsManagement',member='CredentialsError'"
 on conn <dbus._dbus.SessionBus (session) at 0x2fece30>>
2012-04-15 20:53:38,197 - ubuntuone.credentials - DEBUG - shutdown!, ref_count 
is 0.
2012-04-15 20:53:38,197 - ubuntuone.credentials - INFO - Shutting down, calling 
<built-in method quit of glib.MainLoop object at 0x7f8611ba6f90>.

** Affects: ubuntuone-control-panel (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/982486

Title:
  ubuntuone DBusException Failed to create necessary plain keys.

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