If you right click the SynceTrayIcon and choose "Explorer with filemanager" in Ubuntu 9.10, Nautilus can show the following error:

1. Go to "System" -> "Administration" -> "Software Sources".
2. Click on "Other Software".
3. Click the "Add" button.
4. At the command APT line enter:
   
   Code:

   deb http://ppa.launchpad.net/synce/ubuntu karmic main

5. Click the "+add source" again.
6. Click the "Close" button.
7. Click the "Reload" button.
8. Then in the Terminal run
   
   Code:

   sudo apt-get update
   sudo apt-get install synce-gvfs

9. Reboot