Xubuntu Dropbox icon fail [duplicate]

A more recent workaround that works for more Linux operating systems than the DBUS_SESSION one:

dropbox stop && dbus-launch dropbox start

EDIT: To make this permanent see answer by @juankvillegas below.

The answer given by @Juan M. Gonzalez is the best one, but you have to run that command every time you restart your PC.

A permanent fix would be:

• Run the proposed command once to make the Dropbox icon appear in your notification area: dropbox stop && dbus-launch dropbox start
• Open Dropbox preferences (click on the Dropbox icon in the notification area).
• Disable "Start Dropbox on system startup" and apply your changes.
• Go to XFCE settings > Session and Startup > Application Autostart.
• Search for an existing Dropbox item and confirm it is disabled.
• Add a new item with this configuration (do not edit the existing Dropbox item because it is recreated in each reboot):
  • Name: Dropbox
  • Command: dbus-launch dropbox start -i
• Be sure that the new application is enabled in the list.