Dropbox Icon missing in Ubuntu

On Ubuntu 12.04 as well as 14.04 with recent versions of compiz, dropbox or whatever other module the Dropbox icon may be missing in the upper right corner (system tray) after login.

This is in general just an annoyance because Dropbox is still running in background (you can check this by opening your Dropbox folder and you will see the checkmark icons and the dropbox context menu entry when right-clicking a file - which are only visible when Dropbox is running).

However, I found several forum and blog posts mentioning that

sudo apt-get install libappindicator1

solves the issue or

sudo apt-get install nautilus-dropbox

solves it. I already had libappindicator1 However in reality the latter is obsolete as the nautilus integration is no separate thing any more. So both did not solve the issue for me.

I solved it permanently only by writing a short shell script (which i put into /opt directory):

 #!/bin/bash  
 sleep 60s  
 dropbox stop && dropbox start -i &  

(mark as executable) and then click on the Ubuntu button on the left upper corner, type "startup" and there add an entry to call that start that shell script /opt/dropboxrestart.sh.