Slack icon not visible in top right corner in ubuntu

When I restart the Ubuntu system, slack application is not visible in the top right corner.

How to solve that?

Solution 1:

Restart GNOME shell. Open the terminal and type:

setsid gnome-shell --replace  

Press Enter again before you close the terminal.

Solution 2:

On Ubuntu 18.04, be cautious using:

setsid gnome-shell --replace  

If you lock your computer, you will be unable to log back in. You will be stuck with an Authentication Incorrect error and will need to do a hard reset due to your keyboard not working for the login screen (no way to get to a shell either).

On Ubuntu 18.04, you can run:

killall -HUP gnome-shell

This will restart this as expected and has no negative affects