"GError: No database available to save your configuration" on Ubuntu Tweak 0.5.14 / Ubuntu 10.04

Distribution: Ubuntu 10.04 lucid
Application: Ubuntu Tweak 0.5.14
Desktop: gnome

Traceback (most recent call last):
  File "/usr/bin/ubuntu-tweak", line 110, in <module>
    launcher = TweakLauncher(session_bus, MainWindow())
  File "/usr/lib/python2.6/dist-packages/ubuntutweak/mainwindow.py", line 276, in __init__
    self.get_gui_state()
  File "/usr/lib/python2.6/dist-packages/ubuntutweak/mainwindow.py", line 351, in get_gui_state
    self.set_default_size(*TweakSettings.get_window_size())
  File "/usr/lib/python2.6/dist-packages/ubuntutweak/common/config.py", line 147, in get_window_size
    width = cls.config.get_value_from_key(cls.window_width, default=900)
  File "/usr/lib/python2.6/dist-packages/ubuntutweak/common/config.py", line 35, in get_value_from_key
    return self.get_value()
  File "/usr/lib/python2.6/dist-packages/ubuntutweak/conf/gconfsetting.py", line 103, in get_value
    self.set_value(self.__default)
  File "/usr/lib/python2.6/dist-packages/ubuntutweak/conf/gconfsetting.py", line 112, in set_value
    self.__client.set_value(self.__key, value)
GError: No database available to save your configuration: Unable to store a value at key '/apps/ubuntu-tweak/window_width', as the configuration server has no writable databases. There are some common causes of this problem: 1) your configuration path file /etc/gconf/2/path doesn't contain any databases or wasn't found 2) somehow we mistakenly created two gconfd processes 3) your operating system is misconfigured so NFS file locking doesn't work in your home directory or 4) your NFS client machine crashed and didn't properly notify the server on reboot that file locks should be dropped. If you have two gconfd processes (or had two at the time the second was launched), logging out, killing all copies of gconfd, and logging back in may help. If you have stale locks, remove ~/.gconf*/*lock. Perhaps the problem is that you attempted to use GConf from two machines at once, and ORBit still has its default configuration that prevents remote CORBA connections - put "ORBIIOPIPv4=1" in /etc/orbitrc. As always, check the user.* syslog for details on problems gconfd encountered. There can only be one gconfd per home directory, and it must own a lockfile in ~/.gconfd and also lockfiles in individual storage locations such as ~/.gconf