We're currently investigating this issue. While we do this, we'd like to offer you a workaround as a temporary solution.
If you would like to use this workaround, you can do so by opening a Terminal session and running the following command:
dropbox stop && DBUS_SESSION_BUS_ADDRESS="" dropbox start
Several users have reported that this workaround is successful and have documented more information in the following Ubuntu forum:
http://askubuntu.com/questions/73296.../736205#736205
Please note that it is possible that you will need to run this workaround every time you restart your computer.
Finally, please take into account that this is a workaround intended for Xubuntu and XFCE based Linux distributions; however, you can also try these steps if you're running KDE or any other desktop environment, but since these others would not be within the list of requirements to run Dropbox on Linux, we may not be able to provide further support.
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