It looks like some Ubuntu 18.04 update disable all non-system apps Tray Icons. Now those apps that should be minimized by clicking close (x) title bar's button. In this list all my apps with system tray icons like: Skype, ICQ, Telegram. + No any status indications.
Example:
As you can see is no Skype icon on example above.
Partially fixed for Skype and Telegram.
Now I see both icons for Telegram and Skype. Both applications continue work after closing by
(x)
close button on app window top panel. BTW ICQ not show Sys Icon, but also have same behavior like Skype and Telegram by close button click (continue working).step 1: check whether you are using the tweak tool. If not then install that first.
step 2: install a package named
chrome-gnome-shell
. For that you just have to fire a commandsudo apt install chrome-gnome-shell
step 3: go to https://extensions.gnome.org/extension/615/appindicator-support/ and you will find on/off toggle. toggle on, and the issue will be gone.