** Description changed:

- Binary package hint: ubuntuone-client
+ This error happens because Ubuntu SSO cannot be contacted by ubuntuone-
+ login process. Eventually the latter gives up and throws a DBus error.
  
- Apport send me here. I didn't do anything special, and I didn't try to
- access UbuntuOne.
+ If you are experiencing this issue please check whether you have a
+ custom python installation used by default:
  
- ProblemType: Crash
- DistroRelease: Ubuntu 11.04
- Package: ubuntuone-client 1.5.3-0ubuntu3
- ProcVersionSignature: Ubuntu 2.6.38-1.28-generic 2.6.38-rc2
- Uname: Linux 2.6.38-1-generic x86_64
- Architecture: amd64
- Date: Tue Feb  1 11:07:59 2011
- ExecutablePath: /usr/lib/ubuntuone-client/ubuntuone-login
- InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64+mac (20101223)
- InterpreterPath: /usr/bin/python2.7
- PackageArchitecture: all
- ProcCmdline: /usr/bin/python /usr/lib/ubuntuone-client/ubuntuone-login
- ProcEnviron:
-  SHELL=/bin/bash
-  LC_MESSAGES=fr_FR.utf8
-  LANGUAGE=fr_FR:fr:en_GB:en
-  LANG=fr_FR.UTF-8
- PythonArgs: ['/usr/lib/ubuntuone-client/ubuntuone-login']
- SourcePackage: ubuntuone-client
- Title: ubuntuone-login crashed with ValueError in call_async(): Unable to 
guess signature from an empty dict
- UbuntuOneClientConfig:
-  [ubuntuone]
-  bookmarked = True
-  connected = True
-  connect = 0
-  show_applet = 1
- UbuntuOneSyncdaemonExceptionsLog:
-  2011-02-01 11:08:24,102 - ubuntuone.SyncDaemon.DBus - ERROR - Handling DBus 
error on _request_token: DBusException(dbus.String(u'Did not receive a reply. 
Possible causes include: the remote application did not send a reply, the 
message bus security policy blocked the reply, the reply timeout expired, or 
the network connection was broken.'),).
-  2011-02-01 11:08:24,180 - twisted - ERROR - Unhandled error in Deferred:
-  2011-02-01 11:08:24,180 - twisted - ERROR - Unhandled Error
-  Traceback (most recent call last):
-  Failure: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: 
Did not receive a reply. Possible causes include: the remote application did 
not send a reply, the message bus security policy blocked the reply, the reply 
timeout expired, or the network connection was broken.
- UbuntuOneUserSyncdaemonConfig:
-  [bandwidth_throttling]
-  read_limit = 2097152
-  write_limit = 2097152
-  on = False
- UserGroups: adm admin cdrom dialout libvirtd lpadmin plugdev sambashare
+ which python
+ 
+ Expected output: /usr/bin/python
+ 
+ If you have e.g. another python binary in /usr/local/bin and `which
+ python` shows it then ubuntu-sso-client will fail to start leading to
+ this issue.
+ 
+ If you don't have another python installation please leave a comment
+ with the output of:
+ 
+ /usr/lib/ubuntu-sso-client/ubuntu-sso-login-qt --app_name test

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https://bugs.launchpad.net/bugs/711162

Title:
  ubuntuone-login crashed with ValueError in call_async(): Unable to
  guess signature from an empty dict

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