I installed the newest Chrome-version (38). Before that I was using version 34 and the dropbox indicater was in the system tray. After installing Chrome after restarting a message showed up indicating that an additional library had to be installed (libappindicator1). Unfortunately this removed Chrome.
I re-installed Chrome and the problem appeared again. When I manually tried to install libappindicater1 (sudo apt-get install libappindicator1) there indeed is a warning that Chrome will be removed (it's in Dutch).
De volgende pakketten zullen VERWIJDERD worden: google-chrome-stable:i386 libappindicator1:i386 libindicator7:i386
Dropbox seems to be working fine but how can I get the icon back without removing Chrome?
Someone else had this problem and fixed it with a new install but re-installing Ubuntu is no option for me.