I have installed lightdm + cinnamon on Ubuntu 20.04 Server 64-bit for Raspberry Pi 4.
The systray network icon shows me disconnected from the internet while in reality I am connected.
None of the solutions offered by the internet solved my problem. This problem could be due to some missing package but I have no idea what it is.
I ran the following commands:
sudo apt update
sudo apt dist-upgrade
sudo reboot
sudo apt install --install-recommends lightdm
sudo apt install --install-recommends cinnamon-desktop-environment
sudo reboot
Cinnamon works but now I show you the network icon what it shows me with an image: