nautilus-dropbox dropbox does not show tray dropdown menu correctly on GNOME FlashBack session

[Norbert]

Steps to reproduce:
1. Install Ubuntu 18.04 LTS
2. Install `gnome-panel` and `nautilus-dropbox` packages
3. Log-in to the GNOME FlashBack session
4. Set-up Dropbox by launching it from *Applications->Internet->Dropbox* (confirm downloading proprietary part, log-in to account, wait tray icon to appear)
5. Log-out and reboot
6. Log-in to the GNOME FlashBack sessio again

Expected results:
* Dropbox tray icon and drop-down menu are shown correctly

Actual results:
* Dropbox tray icon and drop-down menu are not shown correctly (see screenshot).

Notes:
* first seen on AskUbuntu ( https://askubuntu.com/q/1029225/66509 ).

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: nautilus-dropbox 2015.10.28-1ubuntu2
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: GNOME-Flashback:GNOME
Date: Sat Apr 28 18:13:10 2018
InstallationDate: Installed on 2018-04-28 (0 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: nautilus-dropbox
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Alberts Muktupāvels (muktupavels)]

1. Stop dropbox.
2. Open /usr/share/applications/dropbox.desktop for editing.
3. Change "Exec=dropbox start -i" to "Exec=env XDG_CURRENT_DESKTOP=Unity dropbox start -i".
4. Copy /usr/share/applications/dropbox.desktop to ~/.config/autostart/dropbox.desktop or just make same change to autostart file.

[Éric Piel (pieleric)]

I had a similar issue here, but solved it with the following:
killall indicator-application-service
sudo apt remove indicator-application

[Kirill Shustov (kirill-sustov)]

not working on ubuntu 18.04.1 with gnome fallback

[Eugene San (eugenesan)]

I use a different workaround, which seems to fix additional indicators besides dropbox.
In file /usr/share/xsessions/gnome-flashback-metacity.desktop, I add "Ubuntu;Unity" to the variable "DesktopNames".

[Samer Masterson (samertm)]

Hey, sorry for the long delay in fixing this bug. This issue should be fixed in the latest beta build, v64, without the dbus-launch hack (tested with Gnome Flashback on Ubuntu 18.04).

You can download it from this page: https://www.dropboxforum.com/t5/Desktop-client-builds/Beta-Build-64-3-120/m-p/317429

Untar it into your home directory to install it (it will extract everything into .dropbox-dist).