XUbuntu系统DropBox托盘图标异常求助：红圈叉号且无关联菜单

I’ve battled this exact Dropbox tray icon issue on XUbuntu across multiple machines and versions—total pain, right? The common forum fixes never worked for me either, but these are the solutions that finally got my icon back with a working menu:

• Reset Dropbox’s Cache & Desktop Integration
  Start by fully shutting down Dropbox and clearing its corrupted cache data:

  dropbox stop
  dropbox clean
  dropbox start
  

  More often than not, this simple reset fixes the broken icon association.

• Force Dropbox to Play Nice with Xfce’s Tray
  Xfce’s native panel tray can be finicky with Dropbox. Tweak the autostart config to force compatibility:

  1. Open Dropbox’s autostart file in a text editor:

     nano ~/.config/autostart/dropbox.desktop
     

  2. Find the Exec= line and change it to:

     Exec=env XDG_CURRENT_DESKTOP=Unity dropbox start -i
     

  3. Save the file, log out and back in, or just restart Dropbox.
     If that doesn’t work, try launching Dropbox with this environment variable to bypass DBus conflicts:

  env DBUS_SESSION_BUS_ADDRESS="" dropbox start -i
  

• Use a Third-Party Tray Tool
  If Xfce’s tray is the root of the problem, switch to stalonetray—a lightweight, reliable standalone tray:

  1. Install it via apt:

     sudo apt install stalonetray
     

  2. Add it to your Xfce startup: Go to Settings > Session and Startup > Application Autostart, click Add, and use this command (adjust the geometry/size to match your screen):

     stalonetray --geometry 1x1+1900+0 --icon-size 24 --skip-taskbar
     

  3. Restart your session, and Dropbox should automatically connect to this new tray instead of the Xfce panel.

• Full Uninstall & Fresh Reinstall
  If all else fails, wipe Dropbox completely and start over:

  dropbox stop
  sudo apt remove --purge dropbox
  rm -rf ~/.dropbox ~/.config/dropbox
  

  Then install the latest version directly from Dropbox (either download the .deb package from their site or run this script):

  cd ~
  wget -O - "https://www.dropbox.com/download?plat=lnx.x86_64" | tar xzf -
  ~/.dropbox-dist/dropboxd
  

  Follow the prompts to re-link your account, and the icon should work properly.

One final check: If none of these work, try switching to the default Adwaita or Xfce icon theme—some custom themes break Dropbox’s tray icon rendering.

内容的提问来源于stack exchange，提问作者Etienne38