Edit: The popup problem is caused by Chrome Remote Desktop. When I uninstalled it, the problem is resolved. However, I want to have this app. How can I manage to have it without seeing disturbing popups?
Edit2: I have installed the CRD following the official website remotedesktop.google.com. It just installs the addon for Firefox, and the CRD package itself. However, I faced another problem, and followed the solution proposed at https://askubuntu.com/a/1306552/1183850. I did not connect to my computer from another device using CRD. Even if I did not connect, I have faced these popups. That is why I am asking for help. I do not want to see these popups when I do not use CRD. If I use it, I will be happy to see these popups.
Today, I have installed Chrome Remote Desktop to my Ubuntu 20.04 LTS machine. However, when I restart my machine, I was asked my password for couple of Authentication Required popups. I was also unable to change my screen brightness (this issue is resolved when I remove my computer from Chrome Remote Desktop). However, the popup thing remains the same. Also, an error message appears everytime I start my computer. How can I solve it?
Also, when I try to shutdown the computer from GUI, there is an "Other users are logged in" warning in the popup. I have never seen it before.