Click on Dropbox icon after it starts up. Go to the "Preferences" and uncheck "Start Dropbox on system startup" (to prevent dropbox from changing the startup command after reboot.)
Go to Applications > Preferences > Startup Applications, if Dropbox is already there click on Edit, and if not click on Add.
Enter Name:Dropbox Command:env XDG_CURRENT_DESKTOP=Unity dropbox start Comment:Sync your files across computers and to the web
I can confirm it on clean Ubuntu 18.04 LTS install with GNOME FlashBack session, so I installed only GNOME Panel new package and Nautilus Dropbox plug-in
sudo apt-get install gnome-panel nautilus-dropbox
After installing of nautilus-dropbox I have logged-in to my Dropbox account.
Then after rebooting system I get the same image as OP, so I reported bug 1767665.
The first finds Exec line dropbox start -i in it and changes it to env XDG_CURRENT_DESKTOP=Unity dropbox start (it forces dropbox to "use" Unity desktop even if we are using GNOME), the second creates user XDG-autostart directory, the third line copies XDG-autostart desktop-file to user XDG-autostart directory.
Afterwards Dropbox menu is in place and works as expected.
To sum up:
Run
Click on Dropbox icon after it starts up. Go to the "Preferences" and uncheck "Start Dropbox on system startup" (to prevent dropbox from changing the startup command after reboot.)
Go to Applications > Preferences > Startup Applications, if Dropbox is already there click on Edit, and if not click on Add.
Enter
Name:
Dropbox
Command:
env XDG_CURRENT_DESKTOP=Unity dropbox start
Comment:
Sync your files across computers and to the web
Run
replace
Exec=dropbox start -i
withand
Run
replace
Exec=dropbox start -i
withI can confirm it on clean Ubuntu 18.04 LTS install with GNOME FlashBack session, so I installed only GNOME Panel new package and Nautilus Dropbox plug-in
After installing of
nautilus-dropbox
I have logged-in to my Dropbox account.Then after rebooting system I get the same image as OP, so I reported bug 1767665.
It may be fixed locally as @Alberts Muktupāvels (muktupavels) suggested on launchpad.
I shorten method to just two simple lines:
The first finds
Exec
linedropbox start -i
in it and changes it toenv XDG_CURRENT_DESKTOP=Unity dropbox start
(it forces dropbox to "use" Unity desktop even if we are using GNOME), the second creates user XDG-autostart directory, the third line copies XDG-autostart desktop-file to user XDG-autostart directory.Afterwards Dropbox menu is in place and works as expected.
Current recommended solution - install dropbox ubuntu software center, not .deb
Remove everything
Reboot.
Install dropbox from ubuntu software store
https://www.dropboxforum.com/t5/Installs-integrations/Ubuntu-18-04-appindicators/td-p/295947