Indicator icons do not appear after upgrade to Ubuntu 17.10

Only GNOME extension and native icons are displayed. Other icons like Dropbox, shutter, enpass etc. do not appear in the top bar.

Am I missing something? I already tried using extensions that I used with GNOME before but nothing (Topicons Plus, Ubuntu appindicators etc.) seems to help.

Currently I'm using Ubuntu Xorg, but in Wayland I have the same issue.

I've encountered the same problem. I tried to remove the indicator-application-service completely, and see, the problem went away! I guess coming from 16.04 leaves some Unity-related stuff on my machine that is not only obsolete but prevents the AppIndicator extension from properly working.

What to do:

sudo apt remove indicator-application

I have the same problem with 17.10. At least the following command helps here to bring the icons back until the next reboot:

killall indicator-application-service

Edit: This workaround is running fine here without using any gnome-extension like "Topicon-plus" or "Kstatusnotifieritem/appindicator support".

As suggested here, try removing all obsolete indicators if any still present

indicator-application
indicator-appmenu
indicator-bluetooth
indicator-common
indicator-datetime
indicator-keyboard
indicator-messages
indicator-network
indicator-power
indicator-printers
indicator-session
indicator-sound
indicator-transfer
indicator-transfer-download-manager

Just execute this command in a terminal:

sudo apt purge indicator-application indicator-appmenu indicator-bluetooth indicator-common indicator-datetime indicator-keyboard indicator-messages indicator-network indicator-power indicator-printers indicator-session indicator-sound indicator-transfer indicator-transfer-download-manager

Another possible solution is delete Indicator-application autostart .desktop file. It's installed in

/etc/xdg/autostart/indicator-application.desktop

If you dont want to remove it and sometimes is using Unity 7. This made Indicator-application not start at login.